このキャップがハイカーに選ばれる理由を、
まずは比較してみてください。
U.L. Merino X Cap 2026 VS 一般キャップ
| 比較項目 | U.L. Merino X Cap 2026 | 一般キャップ |
|---|---|---|
| 蒸れ | ◎ 蒸れにくい | ✕ 蒸れやすい |
| 匂い | ◎ 防臭 | ✕ 匂いやすい |
| 強風 | ◎ 飛ばされにくい | △ 飛ばされやすい |
| 軽さ | ◎ 超軽量 | △ |
-
1. Made of 100% merino wool and mesh construction, it stays cool and odor-free even in hot and humid conditions.
It maintains breathability even in hot and humid environments, keeping you comfortable even when you sweat. Natural merino wool manages moisture and provides excellent odor resistance, so you won't have to worry about odor even after wearing it for days .
-
2. Super light and airy, you'll forget you're wearing it
The ultra-fine wool yarn creates an airy lightness that doesn't feel too tight, so you won't feel stressed even after wearing it for a long time.
-
3. X-Pac® visor dries quickly even when wet
This high-performance material dries quickly and does not retain moisture, even when wet from rain or sweat. It is also highly durable and has a structure that is resistant to deformation.
-
4. Flexible eaves that can withstand strong winds
Designed to withstand winds up to 13m/s, it is flexible and supple, allowing the wind to escape while maintaining its shape.
-
5. Skin-friendly sweat absorbent made from natural materials
Made with natural materials that are resistant to rashes and itching even when in direct contact with the skin, they are comfortable to wear for long periods of time.
-
6. Available in three sizes to find the perfect fit
Available in three sizes: S, M, and L. The adjuster allows for fine tuning to fit the shape of your head.
-
7. A minimalist design that blends in both the mountains and the city
Its simple and elegant appearance blends seamlessly into both outdoor and everyday wear, and it can be easily matched with any style.
Let customers speak for us
from 68 reviewsアルプスの強風吹き荒ぶ稜線でも問題ありませんでした。また熱もこもりにくくて快適でした!ただ帽子にしてはいいお値段なので、星マイナス1しました
大汗かきのわたしで、汗が目に入って、何とかならないかって思った時この帽子の存在を知りました。大量に汗をかいているはずなのにサラッとしてるし、匂いもまったくなし。風が強いところもあったのですが、頭にフィットしていてよかったです。お値段が…ちょっとでしたが、悩みを解決できる帽子に出会えてよかったです
かぶり心地が良くって、蒸れないのは抜群。
サイズは大きく感じました。
キャップにこの値段と思いましたが、良い品でした。レビューは値段が高いので星四つ。
真夏の暑い気温でも全く蒸れることもなく、不快感ゼロで、稜線歩きの時は風が結構吹いていて、帽子が飛びそうと言ってる人もいたのですが、そんな不安もなく、さらに被ってるという感覚を忘れるほど軽く、快適でした。そして汗をたっぷりかいても匂いは全くせずでした!本当にオススメです!
キャップ型の帽子はツバが硬いものばかりで、カメラのファインダーを覗く際に邪魔でした。そのためハット型の帽子を使わざるを得ませんでした。長年、ツバの柔らかいキャップを探していましたが、ようやく良いものに出会えました。ファインダーを覗くときもツバが受け流してくれるため、帽子を脱ぐ必要がありません。
それと被っていても風が吹き抜ける感覚があり、快適です。
トレッキングのガイドをしていますが、お客様よりも汗っかきなので、いつも帽子はびしょ濡れ、頭汗はダラダラでしたが、この帽子を購入してからはびしょ濡れ帽子で恥ずかしい思いをすることもなく快適に歩けています。
この帽子に出会えて良かったです❣️
自分はよく頭から汗をかくので蒸れなくて、汗の乾きが良いCapを探してました。
このCapはまったく蒸れなくて快適でびっくりしました!
ツバ部分が防水で蒸れないキャップがあれば便利だな〜と思っていたので自分にぴったりでした。
少しサイズ調整の部分がが固いので素材は別のものの方が良いのではないかと思いました(買ったばかりで硬いだけかもしれませんが)。
色はGreen Forestを選びましたがほぼほぼサイトの写真通りで満足です!
良い意味で言う事無し。
よく汗を吸って、でも臭わない。蒸れない。強風が吹いても飛ばされない。とても軽いなど、キャップに求めている性能を満たしている素晴らしいキャップです。
つばがXPAC素材で軽く本体はメリノウール混なので臭いも気にならず通気性があり気持ちがいいです。
Mを購入しましたが額の狭い私には少し深く感じました。
割と強い風でも飛ばないで耐えてくれました。
それに初日がとんでも無い暴風雨だったのですが、深夜には風が止んだので外で乾かしてたら、朝にはすっかり乾いていたので速乾性に優れていると感じました。
一つ星を減らした理由は、値段がもう少し買い易ければ満点です。
メリノ+X-Packのキャップという他で見たこともない素材に魅力を感じて購入しました
被ってみると被り心地よく丸い形がとても素敵でgoodです
本体部分がALLメッシュになっているので通気性よく全く蒸れません
滝汗族の私は、いつもキャップを脱ぐと風呂上がりレベルのびしょ濡れになるのでとても助かります
登山だけでなく普段の街歩きでもよく利用してます
1番お気に入りのキャップになりました
メリノの帽子っていうところがいいです。
自分けっこう汗っかきで、ポリの帽子だと汗臭くなるんですが、一日中被ってても汗臭くならないのがいいです!
かぶり心地ももちろんいいです!
デザイン、着け心地も今までにない新しいキャップです。
instagramで見つけ、デザインを気に入り購入しました。
軽くて、蒸れず、おしゃれ。
夏シーズンに向けて、二色目も購入しました。
キャップは見た目もかぶり心地も軽くてしっくりきたので気に入りました!あと、キャップにメリノとX-PACの素材の使い分け初めて見たので新鮮でした!
まだ街でしか被っていないが、帽子自体とても軽く、メリノウールの部分は柔らかく心地が良い。ツバの長さも丁度良い。今度は登山で被り、メリノウールの効果を期待したい。
Black Bear
Cloud Gray
Green Forest
Coyote Beige
[Pre-order] UL Merino X Cap 2026
[Pre-order] UL Merino X Cap 2026
⚠️ 重要なお知らせ
Collapsible content
Made with 100% merino wool, it doesn't get stuffy or smelly.
Breaking away from the conventional idea that a cap is just a physical object, the UL Merino X Cap 2026 model is made with 100% merino wool .
This has resulted in improved breathability, odor resistance, and a soft feel against the skin, making the hat even more natural and comfortable to wear .
The "natural comfort" of merino wool
Merino wool is a natural material that contains tiny, invisible layers of air within each fiber.
This structure provides excellent moisture control and breathability , preventing stuffiness even when you sweat and preventing outside air from building up .
It responds to changes in body temperature, providing natural temperature regulation by keeping you cool when it's hot and warm when it's cold .
Furthermore, the keratin protein on the surface of the wool absorbs and neutralizes the sweat and sebum components that cause odor , so it functions as a natural odor-preventing material, preventing odor even after wearing it for days .
You'll stay comfortable even on long hikes or trips.
Knit construction provides airy ventilation
Typical merino wool fabrics have excellent heat retention and moisture control properties, making them very comfortable to wear. The dense weave structure makes it difficult for wind to pass through, and in hot and humid environments like the Japanese summer, heat can easily build up around the head. It's not really suitable as a hat.
The UL Merino X Cap has a unique knitted structure made from merino wool yarn, which creates tiny gaps that allow air to escape like a mesh, creating breathability .
The result is amazing comfort and resistance to stuffiness, even on ridges in the middle of summer or on humid days .
Sustainable materials that are kind to both people and the earth
Merino wool is a renewable natural fiber and is also an earth-friendly , sustainable material that meets the SDGs .
This is a truly modern UL cap that embodies the hiker's values of being "light, comfortable, and natural" and is in line with the cycle of nature .
Lightweight and fits so well you'll forget you're wearing it
You can feel the soft texture when you touch it, and it has an airy fit that feels like it contains air.
You will feel a sense of openness, as if you are not wearing anything .
Surprisingly light
The soft and gentle feel of 100% merino wool further enhances the airy impression.
By eliminating the polyester thread, the entire cap is even lighter.
The 2026 model offers an even more stress-free fit, so comfortable you'll forget you're wearing it .
Since the first model, the peak has been made of the lightweight waterproof fabric X-Pac®, and by deliberately omitting the core material found in ordinary caps, it has achieved the ideal ultra-lightweight design .
In addition, the sweatband is made of extremely thin fabric to eliminate unnecessary bulk.
Eliminating unnecessary thickness and weight around the head also contributes to a feeling of lightness.
In addition, the parts for fine-tuning the size at the rear were also selected with an emphasis on lightness.
Every detail has been made lightweight, making this cap comfortable to wear even when worn for long periods of time. It has been finished in this way.

A comfortable fit that doesn't constrict
The body is made of 100% merino wool and is characterized by its soft, conforming fit to the shape of your head, rather than being stiff and restricting it.
Rather than pressing tightly, it feels like it gently hugs you , making it less stressful even when you're out and about for long periods of time.
In addition, the adjustable part at the back allows for fine adjustments, so you can get the fit you want while still maintaining a balance that is not too tight .
It is designed to be comfortable to wear even during long hikes or long-distance trekking, where you sweat, dry, and then start walking again.

Lightweight and quick-drying X-Pac® canopy
There were windy days on the ridgeline and afternoons when it suddenly turned to rain.
I wanted a canopy that would maintain its shape in those conditions and dry quickly even if it got wet.
The answer was to hire X-Pac®.
Waterproof and lightweight
High-performance materials
It's common to get caught in sudden rain in the mountains, so I wanted the hood of my rainwear to be waterproof .
After comparing materials that were lightweight, durable, and waterproof, we ultimately chose X-Pac® .
This high-performance fabric was developed by Dimension-Polyant, an American company, for use in yacht sails. It has an excellent strength-to-weight ratio and waterproof performance, and is both lightweight and durable .
The beautiful bias pattern of the black polyester X-PLY blends seamlessly into the minimalist design of the UL Merino X Cap, adding a subtle presence.

![]()


Learn more about X-Pac®
Source: Dimension-Polyant authorized dealer
Unique structure that maintains its shape without using a core material
Lightweightness is an important factor, so we have adopted a unique structure that does not use the core material used in ordinary caps, but instead bonds the top and bottom fabrics together with resin .
This means that it does not retain water even when wet in the rain, dries quickly, and does not lose its shape even when blown by the wind. The structure is realized, achieving both moderate tension and flexibility.
This visor was completed through repeated trial and error in collaboration with a hat manufacturer to ensure consistent quality during mass production, and is robust enough to be used safely even in strong winds or on long mountain hikes .

*This product has not been tested for waterproofing; this is a characteristic of the X-Pac® material.
Peace of mind knowing the shape will stay intact even in bad weather
The visors performed well even in tough conditions, such as when hiking the Northern Alps or in strong winds on ridgelines.
In a situation where the maximum instantaneous wind speed was 13 m/s, We have confirmed that it is resistant to being blown away by strong winds and is flexible enough to maintain its shape while deflecting the wind .
This is not a hard cap with a core like a typical cap, but a flexible design that allows wind to escape by bending. That's why we can do it.
Even if it gets wet from prolonged rain or sweat, it does not retain water, is not heavy, and dries quickly .
This canopy allows you to walk safely in any weather.
*The image shows the color of the old model.
*Wind speed figures are estimates based on YAMATOMO.FUN field tests. Actual wind speeds may vary depending on the usage environment.

Skin-friendly sweat absorbent made from natural materials
Even on summer hikes where sweating is unavoidable, keep your forehead as comfortable as possible.
With this in mind, the sweat-absorbing part that comes into direct contact with the skin has been designed with Lawn fabric is a blend of natural cotton and linen. We have adopted the following.
The parts that come into contact with the skin are made of natural materials
Instead of using the synthetic COOLMAX® sweat-absorbing material commonly used in sports caps, we have chosen natural fibers that are soft and gentle on the skin in order to reduce stuffiness and itching on the forehead, even if only a little.
Woven from fine yarn, lawn is very thin, highly breathable, light, and smooth to the touch .
Easy to dry and stays clean
In addition, the hemp content makes it less susceptible to bacterial growth and allows the fabric to dry quickly even when wet .
Even when you are active for long periods of time, your forehead will not feel sticky and you can continue to wear it without any stress .
The gentleness of natural materials supports comfort in invisible areas.
Available in three sizes: S, M, and L for the perfect fit
To make the most of the lightness and softness, a good fit is very important.
The original model was only available in one size, but we have updated it to offer three sizes: S, M, and L so that more hikers can wear it comfortably.
Size design to find the "just right"
Everyone has different head shapes and preferences for how they wear their heads.
It is designed with a balance that naturally suits those who want a light, shallow fit, as well as those who want a tighter fit.
Our goal was to create a cap that would feel comfortable the moment you put it on, no matter what size you choose.
Find the size that suits you and looks great.
The well-balanced shape provides an airy, stress-free fit and a beautiful silhouette as a cap.
Available in three sizes, you can find the perfect fit for you.
Fine-tuned strap construction
Each size can be adjusted within a range of approximately ±2cm from the standard head circumference (R).
The strap can be neatly stored inside the cap body , so it doesn't spoil the appearance and doesn't get caught on a backpack.
A size that is easy to choose even if it does not overlap
So you can choose with confidence, even online.
The balance between head circumference (R) and height (H) is clearly indicated, so by comparing it with the cap you normally wear, it is easy to imagine the size even if you don't wear it .
The light and soft merino wool body gently envelops subtle individual differences , ensuring a comfortable fit.
R = Round (head circumference) / H = High (height)
Stylish design that suits both the mountains and the city
A cap that you can wear naturally anywhere.
The UL Merino X Cap strikes a balance between function and design , making it at home on a mountain ridge or in a local cafe.


Minimalist design that highlights X-Pac®
The back strap is made of X-Pac®, the same waterproof material as the visor.
The uniform coloring and texture make this a design that is suitable for both outdoor and urban use .
Functional in the mountains, casually stylish in the city.


Goes great with helmets and knit caps
The soft merino wool body is comfortable to wear over a helmet or knit cap , making it ideal for layering in cold weather.
With just one cap, you can seamlessly enjoy any season and occasion.

*The image shows the color of the old model.
Collapsible content
The story behind the UL Merino X Cap
Searching for the perfect cap
I've tried many different caps when mountain climbing and hiking, but I've never found the perfect one that I thought was the perfect fit .
There were some caps whose designs I liked, but I felt like "I wish there were more colors and materials that suited my tastes."
If you can't find it on the market, make your ideal cap yourself.
This was the beginning of the development of the UL Merino X Cap.
Can be worn in summer
Merino wool
When we first started developing the product, a few manufacturers were already selling merino wool caps, but they were all for autumn and winter.
So, I wanted to create a merino wool cap that could be worn comfortably even in summer - that was the trigger for development.
Inspired by the structure of kefir hats and straw hats, we came up with the idea of ensuring breathability by knitting it with merino wool yarn .
The eaves needed to be waterproof, so we compared X-Pac® and Dyneema® , which were popular at the time.
We ultimately chose X-Pac® due to its lightness, durability, and beautiful texture.
Repeated prototyping and improvement
Once the material has been decided, the next step is to find a manufacturer to manufacture it.
After contacting several companies, I happened to come across a manufacturer that made caps for a popular brand that I used to wear .
Thinking this was also a chance, I asked them to make a prototype.
We repeatedly tried and tested the product while using it in the mountains, and remade the sample many times.
After repeated improvements, sometimes even dismantling and sewing the cap myself, I finally completed the prototype of the UL Merino X Cap that I was satisfied with .
Before we knew it, about a year and a half had passed from the start of prototyping to the first release.
After a long time, we have finally completed a cap that we are proud to present .
Barriers and challenges of mass production
However, when we requested mass production , we encountered a wall .
We realized how difficult it is to mass-produce something with the same quality as the sample , using materials that have never been used before.
The manufacturer concluded that it would be difficult to mass-produce at the same cost .
However, we were not ready to give up on creating this unique and attractive cap, and continued to explore options with manufacturers .
And now
And finally, the 2024 model was completed.
When I held the finished sample in my hands, I was convinced that "this is something we can deliver to our customers with confidence."
We have evolved and grown together with our manufacturers to bring you the UL Merino X Cap .
We have let go of the fixed idea that "caps are something with a shape" and moved towards a more free-form shape that "prioritizes comfort."
For the 2026 model, the material balance of the main body has been revised and it has evolved to 100% merino wool .
This cap maintains its sophisticated design while being extremely light, soft, and comfortable against the skin , making it kind to both people and the earth .
Perfect for mountain climbing, hiking, camping, and everyday walks. This cap will be with you in any situation. Delivering a pleasant experience I hope so.
In the future, we would like to expand the variety of colors and materials and develop the world of YAMATOMO.FUN, which allows even more freedom of choice .

Price revision and
Message of gratitude
As raw material costs continue to rise, we have expanded our production system and held discussions with manufacturers to raise the price so that more hikers can experience the appeal of this cap.
This is all thanks to everyone who has purchased our products so far .
We would like to express our sincere gratitude .
Collapsible content
SPEC
● Product name
UL Merino X Cap
(Ultralight Merino X Cap)
● Material
Body: 100% merino wool
Eaves: X-Pac® 60% nylon, 40% polyester
Sweat absorbent: Lawn 95% cotton, 5% ramie
● Size
3 sizes: S: R: approx. 56cm, H: approx. 17cm
・M:R: approx. 58cm, H: approx. 17.5cm
・L:R: approx. 60cm, H: approx. 18cm
Eaves length: approx. 7.0cm, width: approx. 18.5cm
● Type/Color
All 4 colors・Black Bear: X-Pac® VX03
Cloud Gray: X-Pac® VX07
・Coyote Beige: X-Pac® VX21
・Green Forest:X-Pac® VX21
● Weight
Approximately 40-50g (may vary depending on material and size)
● Country of origin
Indonesia
Care
Washing instructions

Washing Instructions
- Wash and rinse for about 5 minutes, keep the water temperature below 30°C if possible, use a neutral detergent that does not contain fluorescent agents dissolved in water, and wash by pressing or rubbing with your hands.
- Rinse thoroughly to remove any remaining detergent or slime.
-To finish, dissolve fabric softener in water and soak the merino wool body, then remove the moisture with a towel, stuff a rolled up towel into the body, and dry in the shade.
- Do not wash in a washing machine, spin dry, or tumble dry.
- Do not leave it wet for a long period of time.
For more detailed care instructions, please click here ▼▼▼.
Blog
https://yamatomofun.blog/ul-merino-x-cap-maintenance/
YouTube
FAQ
Frequently asked questions
When will it arrive?
As this is a pre-order, shipping is expected to occur around May to June 2026. However, this may vary slightly.
Can I exchange the size or color of my pre-ordered cap?
If you would like to exchange the size of an item before delivery, please contact us via the inquiry form or LINE . Please note that we may not be able to accommodate your request depending on the period.
Can I change the delivery address?
Changes to delivery addresses will be accepted until the end of February 2026 .
Please contact us via the inquiry form or LINE .
I'm having trouble adjusting the size and it doesn't move very well, so I thought maybe it requires some skill. Could you please tell me?
The size adjustment strap on the back is designed to combine functionality and design, so it may feel stiff, especially at first, but we recommend that you try putting it on and taking it off a few times at first, and then fine-tune it while it is off.
Is it okay to wash it?
Yes, it is fine, but we recommend washing it in the same way as you would wash delicate clothes. We have detailed washing instructions on our blog , so please refer to that.
Can I exchange the size of the product I received?
For size exchanges, please contact us within one week of receiving your UL Merino X Cap. If the item has only been tried on indoors, is clean, odor-free, and unused, and we have the size you require in stock, we will accept the exchange. You will be responsible for the return shipping fee and any additional shipping charges.
Can I exchange the color of the product I received?
For color exchanges, please contact us within one week of receiving your UL Merino X Cap. If the item has only been tried on indoors, is free of stains, odors, and is unused, we will accept color exchanges if the desired color is in stock. You will be responsible for the return shipping fee and any additional shipping charges.
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[Pre-order] UL Merino X Cap 2026
Regular price
€79,95 EUR
Regular price
Sale price
€79,95 EUR
Sale
Sold out
Taxes included.
Shipping calculated at checkout.
Collapsible content
Made with 100% merino wool, it doesn't get stuffy or smelly.
Breaking away from the conventional idea that a cap is just a physical object, the UL Merino X Cap 2026 model is made with 100% merino wool .
This has resulted in improved breathability, odor resistance, and a soft feel against the skin, making the hat even more natural and comfortable to wear .
The "natural comfort" of merino wool
Merino wool is a natural material that contains tiny, invisible layers of air within each fiber.
This structure provides excellent moisture control and breathability , preventing stuffiness even when you sweat and preventing outside air from building up .
It responds to changes in body temperature, providing natural temperature regulation by keeping you cool when it's hot and warm when it's cold .
Furthermore, the keratin protein on the surface of the wool absorbs and neutralizes the sweat and sebum components that cause odor , so it functions as a natural odor-preventing material, preventing odor even after wearing it for days .
You'll stay comfortable even on long hikes or trips.
Knit construction provides airy ventilation
Typical merino wool fabrics have excellent heat retention and moisture control properties, making them very comfortable to wear. The dense weave structure makes it difficult for wind to pass through, and in hot and humid environments like the Japanese summer, heat can easily build up around the head. It's not really suitable as a hat.
The UL Merino X Cap has a unique knitted structure made from merino wool yarn, which creates tiny gaps that allow air to escape like a mesh, creating breathability .
The result is amazing comfort and resistance to stuffiness, even on ridges in the middle of summer or on humid days .
Sustainable materials that are kind to both people and the earth
Merino wool is a renewable natural fiber and is also an earth-friendly , sustainable material that meets the SDGs .
This is a truly modern UL cap that embodies the hiker's values of being "light, comfortable, and natural" and is in line with the cycle of nature .

Lightweight and fits so well you'll forget you're wearing it
You can feel the soft texture when you touch it, and it has an airy fit that feels like it contains air.
You will feel a sense of openness, as if you are not wearing anything .
Surprisingly light
The soft and gentle feel of 100% merino wool further enhances the airy impression.
By eliminating the polyester thread, the entire cap is even lighter.
The 2026 model offers an even more stress-free fit, so comfortable you'll forget you're wearing it .
Since the first model, the peak has been made of the lightweight waterproof fabric X-Pac®, and by deliberately omitting the core material found in ordinary caps, it has achieved the ideal ultra-lightweight design .
In addition, the sweatband is made of extremely thin fabric to eliminate unnecessary bulk.
Eliminating unnecessary thickness and weight around the head also contributes to a feeling of lightness.
In addition, the parts for fine-tuning the size at the rear were also selected with an emphasis on lightness.
Every detail has been made lightweight, making this cap comfortable to wear even when worn for long periods of time. It has been finished in this way.

A comfortable fit that doesn't constrict
The body is made of 100% merino wool and is characterized by its soft, conforming fit to the shape of your head, rather than being stiff and restricting it.
Rather than pressing tightly, it feels like it gently hugs you , making it less stressful even when you're out and about for long periods of time.
In addition, the adjustable part at the back allows for fine adjustments, so you can get the fit you want while still maintaining a balance that is not too tight .
It is designed to be comfortable to wear even during long hikes or long-distance trekking, where you sweat, dry, and then start walking again.

Lightweight and quick-drying X-Pac® canopy
There were windy days on the ridgeline and afternoons when it suddenly turned to rain.
I wanted a canopy that would maintain its shape in those conditions and dry quickly even if it got wet.
The answer was to hire X-Pac®.
Waterproof and lightweight
High-performance materials
It's common to get caught in sudden rain in the mountains, so I wanted the hood of my rainwear to be waterproof .
After comparing materials that were lightweight, durable, and waterproof, we ultimately chose X-Pac® .
This high-performance fabric was developed by Dimension-Polyant, an American company, for use in yacht sails. It has an excellent strength-to-weight ratio and waterproof performance, and is both lightweight and durable .
The beautiful bias pattern of the black polyester X-PLY blends seamlessly into the minimalist design of the UL Merino X Cap, adding a subtle presence.



Learn more about X-Pac®
Source: Dimension-Polyant authorized dealer
Unique structure that maintains its shape without using a core material
Lightweightness is an important factor, so we have adopted a unique structure that does not use the core material used in ordinary caps, but instead bonds the top and bottom fabrics together with resin .
This means that it does not retain water even when wet in the rain, dries quickly, and does not lose its shape even when blown by the wind. The structure is realized, achieving both moderate tension and flexibility.
This visor was completed through repeated trial and error in collaboration with a hat manufacturer to ensure consistent quality during mass production, and is robust enough to be used safely even in strong winds or on long mountain hikes .

*This product has not been tested for waterproofing; this is a characteristic of the X-Pac® material.
Peace of mind knowing the shape will stay intact even in bad weather
The visors performed well even in tough conditions, such as when hiking the Northern Alps or in strong winds on ridgelines.
In a situation where the maximum instantaneous wind speed was 13 m/s, We have confirmed that it is resistant to being blown away by strong winds and is flexible enough to maintain its shape while deflecting the wind .
This is not a hard cap with a core like a typical cap, but a flexible design that allows wind to escape by bending. That's why we can do it.
Even if it gets wet from prolonged rain or sweat, it does not retain water, is not heavy, and dries quickly .
This canopy allows you to walk safely in any weather.

*Wind speed figures are estimates based on YAMATOMO.FUN field tests. Actual wind speeds may vary depending on the usage environment.

Skin-friendly sweat absorbent made from natural materials
Even on summer hikes where sweating is unavoidable, keep your forehead as comfortable as possible.
With this in mind, the sweat-absorbing part that comes into direct contact with the skin has been designed with Lawn fabric is a blend of natural cotton and linen. We have adopted the following.
The parts that come into contact with the skin are made of natural materials
Instead of using the synthetic COOLMAX® sweat-absorbing material commonly used in sports caps, we have chosen natural fibers that are soft and gentle on the skin in order to reduce stuffiness and itching on the forehead, even if only a little.
Woven from fine yarn, lawn is very thin, highly breathable, light, and smooth to the touch .
Easy to dry and stays clean
In addition, the hemp content makes it less susceptible to bacterial growth and allows the fabric to dry quickly even when wet .
Even when you are active for long periods of time, your forehead will not feel sticky and you can continue to wear it without any stress .
The gentleness of natural materials supports comfort in invisible areas.

Available in three sizes: S, M, and L for the perfect fit
To make the most of the lightness and softness, a good fit is very important.
The original model was only available in one size, but we have updated it to offer three sizes: S, M, and L so that more hikers can wear it comfortably.
Size design to find the "just right"
Everyone has different head shapes and preferences for how they wear their heads.
It is designed with a balance that naturally suits those who want a light, shallow fit, as well as those who want a tighter fit.
Our goal was to create a cap that would feel comfortable the moment you put it on, no matter what size you choose.
Find the size that suits you and looks great.
The well-balanced shape provides an airy, stress-free fit and a beautiful silhouette as a cap.
Available in three sizes, you can find the perfect fit for you.
Fine-tuned strap construction
Each size can be adjusted within a range of approximately ±2cm from the standard head circumference (R).
The strap can be neatly stored inside the cap body , so it doesn't spoil the appearance and doesn't get caught on a backpack.

A size that is easy to choose even if it does not overlap
So you can choose with confidence, even online.
The balance between head circumference (R) and height (H) is clearly indicated, so by comparing it with the cap you normally wear, it is easy to imagine the size even if you don't wear it .
The light and soft merino wool body gently envelops subtle individual differences , ensuring a comfortable fit.
R = Round (head circumference) / H = High (height)


Stylish design that suits both the mountains and the city
A cap that you can wear naturally anywhere.
The UL Merino X Cap strikes a balance between function and design , making it at home on a mountain ridge or in a local cafe.


Minimalist design that highlights X-Pac®
The back strap is made of X-Pac®, the same waterproof material as the visor.
The uniform coloring and texture make this a design that is suitable for both outdoor and urban use .
Functional in the mountains, casually stylish in the city.



Goes great with helmets and knit caps
The soft merino wool body is comfortable to wear over a helmet or knit cap , making it ideal for layering in cold weather.
With just one cap, you can seamlessly enjoy any season and occasion.


*The image shows the color of the old model.
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The story behind the UL Merino X Cap
Searching for the perfect cap
I've tried many different caps when mountain climbing and hiking, but I've never found the perfect one that I thought was the perfect fit .
There were some caps whose designs I liked, but I felt like "I wish there were more colors and materials that suited my tastes."
If you can't find it on the market, make your ideal cap yourself.
This was the beginning of the development of the UL Merino X Cap.
Can be worn in summer
Merino wool
When we first started developing the product, a few manufacturers were already selling merino wool caps, but they were all for autumn and winter.
So, I wanted to create a merino wool cap that could be worn comfortably even in summer - that was the trigger for development.
Inspired by the structure of kefir hats and straw hats, we came up with the idea of ensuring breathability by knitting it with merino wool yarn .
The eaves needed to be waterproof, so we compared X-Pac® and Dyneema® , which were popular at the time.
We ultimately chose X-Pac® due to its lightness, durability, and beautiful texture.
Repeated prototyping and improvement
Once the material has been decided, the next step is to find a manufacturer to manufacture it.
After contacting several companies, I happened to come across a manufacturer that made caps for a popular brand that I used to wear .
Thinking this was also a chance, I asked them to make a prototype.
We repeatedly tried and tested the product while using it in the mountains, and remade the sample many times.
After repeated improvements, sometimes even dismantling and sewing the cap myself, I finally completed the prototype of the UL Merino X Cap that I was satisfied with .
Before we knew it, about a year and a half had passed from the start of prototyping to the first release.
After a long time, we have finally completed a cap that we are proud to present .
Barriers and challenges of mass production
However, when we requested mass production , we encountered a wall .
We realized how difficult it is to mass-produce something with the same quality as the sample , using materials that have never been used before.
The manufacturer concluded that it would be difficult to mass-produce at the same cost .
However, we were not ready to give up on creating this unique and attractive cap, and continued to explore options with manufacturers .
And now
And finally, the 2024 model was completed.
When I held the finished sample in my hands, I was convinced that "this is something we can deliver to our customers with confidence."
We have evolved and grown together with our manufacturers to bring you the UL Merino X Cap .
We have let go of the fixed idea that "caps are something with a shape" and moved towards a more free-form shape that "prioritizes comfort."
For the 2026 model, the material balance of the main body has been revised and it has evolved to 100% merino wool .
This cap maintains its sophisticated design while being extremely light, soft, and comfortable against the skin , making it kind to both people and the earth .
Perfect for mountain climbing, hiking, camping, and everyday walks. This cap will be with you in any situation. Delivering a pleasant experience I hope so.
In the future, we would like to expand the variety of colors and materials and develop the world of YAMATOMO.FUN, which allows even more freedom of choice .

Price revision and
Message of gratitude
As raw material costs continue to rise, we have expanded our production system and held discussions with manufacturers to raise the price so that more hikers can experience the appeal of this cap.
This is all thanks to everyone who has purchased our products so far .
We would like to express our sincere gratitude .
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SPEC
● Product name
(Ultralight Merino X Cap)
● Material
Body: 100% merino wool
Eaves: X-Pac® 60% nylon, 40% polyester
Sweat absorbent: Lawn 95% cotton, 5% ramie
● Size
3 sizes: S: R: approx. 56cm, H: approx. 17cm
・M:R: approx. 58cm, H: approx. 17.5cm
・L:R: approx. 60cm, H: approx. 18cm
Eaves length: approx. 7.0cm, width: approx. 18.5cm
● Type/Color
All 4 colors・Black Bear: X-Pac® VX03
Cloud Gray: X-Pac® VX07
・Coyote Beige: X-Pac® VX21
・Green Forest:X-Pac® VX21
● Weight
Approximately 40-50g (may vary depending on material and size)
● Country of origin
Indonesia
Care
Washing instructions

Washing Instructions
- Wash and rinse for about 5 minutes, keep the water temperature below 30°C if possible, use a neutral detergent that does not contain fluorescent agents dissolved in water, and wash by pressing or rubbing with your hands.
- Rinse thoroughly to remove any remaining detergent or slime.
-To finish, dissolve fabric softener in water and soak the merino wool body, then remove the moisture with a towel, stuff a rolled up towel into the body, and dry in the shade.
- Do not wash in a washing machine, spin dry, or tumble dry.
- Do not leave it wet for a long period of time.
For more detailed care instructions, please click here ▼▼▼.
Blog
https://yamatomofun.blog/ul-merino-x-cap-maintenance/
YouTube
FAQ
Frequently asked questions
When will it arrive?
As this is a pre-order, shipping is expected to occur around May to June 2026. However, this may vary slightly.
Can I exchange the size or color of my pre-ordered cap?
If you would like to exchange the size of an item before delivery, please contact us via the inquiry form or LINE . Please note that we may not be able to accommodate your request depending on the period.
Can I change the delivery address?
Changes to delivery addresses will be accepted until the end of February 2026 .
Please contact us via the inquiry form or LINE .
I'm having trouble adjusting the size and it doesn't move very well, so I thought maybe it requires some skill. Could you please tell me?
The size adjustment strap on the back is designed to combine functionality and design, so it may feel stiff, especially at first, but we recommend that you try putting it on and taking it off a few times at first, and then fine-tune it while it is off.
Is it okay to wash it?
Yes, it is fine, but we recommend washing it in the same way as you would wash delicate clothes. We have detailed washing instructions on our blog , so please refer to that.
Can I exchange the size of the product I received?
For size exchanges, please contact us within one week of receiving your UL Merino X Cap. If the item has only been tried on indoors, is clean, odor-free, and unused, and we have the size you require in stock, we will accept the exchange. You will be responsible for the return shipping fee and any additional shipping charges.
Can I exchange the color of the product I received?
For color exchanges, please contact us within one week of receiving your UL Merino X Cap. If the item has only been tried on indoors, is free of stains, odors, and is unused, we will accept color exchanges if the desired color is in stock. You will be responsible for the return shipping fee and any additional shipping charges.