Bamboo Short Sleeve Shirt
¥ 9,350 Tax included
Tough but Elegant
Being elegant but tough, this shirt is perfect both on and off the trail.
Made of smooth bamboo fibers blended with polyester, it has great humidity-absorbing and deodorizing qualities similar to those of wool, keeping you comfortable and cool even in warm weather. The highly UV protective fabric keeps your skin safe from the sun.
Made in Fukushima, Japan
Bamboo Polyester (50% Rayon, 50％ Polyester) 118g/㎡
135g (Size S)
143g (Size M)
149g (Size L)
WOMEN | S / M / L
Akira Natsume, Yamatomichi Founder
As I get older, I find myself wearing shirts more often when I’m at home. That got me thinking. Why not make a really great mountain shirt?
The right choice of clothing for the ultralight hiker might be a base layer of Merino wool with an ultralight wind shell or a breathable rain shell with good ventilation. However, it is boring to go to the mountains with the same outfit every time, and I think you should have some freedom when going on a hike.
When I started thinking about what kind of shirts I wanted to wear in the mountains, I did not want to wear something inferior and less comfortable than the Merino wool base layer that I had grown used to for its functionality and safety.
A 100% synthetic fiber shirt would be hot and it would make me smell, so obviously that wouldn’t work. I also did not like the over-designed shirts from most other outdoor brands.
I started testing various designs and materials, including Merino wool, a couple of years ago. After more than ten prototypes I finally had something flexible enough to wear while hiking.
Unlike cut-and-sew fabric, shirts are made of woven fabric, giving them superior wind resistance and durability. If you choose a slightly larger size, air will circulate inside the shirt, making it easier to get rid of your body heat while moving. If you are still hot, you can unbutton the whole shirt to let the heat out, thus shirts are easier to use in terms of temperature control. You can also flip up the collar to protect yourself from ultraviolet rays from the sun or a strong gust of wind.
As for the material, the 100% Merino wool shirt, which was my favorite at first, was extremely comfortable as expected. However, at 200g/m2 the Merino we used was quite heavy. It was okay from autumn to winter, but it felt too hot in the summer. Since I love wool, I was strongly leaning toward just going ahead with this fabric anyway, but deep down, I kept wondering if there might not be a different fabric available…
I then came across a blend of bamboo and polyester. It regulates humidity much like wool and also offers great protection against ultraviolet rays. At around 120g/m2 it’s half the weight of Merino wool and is rather tough considering its weight. It’s also soft to the touch and less expensive than wool.
At the same time, we were working on the UL Short Sleeve Shirt using Pertex Quantum Air, but this bamboo/polyester blend also seemed to offer something worth further exploration.
The UL Short Sleeve Shirt is superior in terms of lightness and fast-drying properties, but it is not necessarily better when it comes to durability. Also, since the material is thin, it does not absorb much sweat, so you might feel chilly when exposed to wind or rain.
On the other hand, the Bamboo Short Sleeve Shirt is durable, protects against ultraviolet rays, and has natural deodorizing properties, making it closer to the initial idea I had for a mountain shirt. This shirt can be worn casually just like T-shirts but also looks smart when you want to dress up a little.
Before releasing we made a couple of small adjustments as the added single button to keep the collar up for wind production. I finally thought we were now ready to launch our line of Yamatomichi hiking shirts.
Form and Function
Bamboo fibers absorb the discomforting heat and the accumulating humidity, while polyester has excellent fast-drying properties and durability. This 50/50 blend brings the best of both worlds for a tough and comfortable piece of fabric.
In a hot, humid environment, it is better to have fibers that absorb a lot of moisture to maintain a smooth texture. If the temperature is cold, it is better to use fibers that do not absorb a lot of moisture to keep comfortable and not feel too dry.
The chart below compares the moisture content inside the fibers in a hot, humid environment (a temperature of 30 degrees and 90% humidity) and an environment with optimal humidity (a temperature of 20 degrees and 65% humidity) . We found that bamboo polyester maintains an optimal moisture content in both environments, and it has excellent humidity absorbency compared to a 100% polyester material.
High Deodorizing Properties
Bamboo polyester has been confirmed to have more than double the deodorizing properties that deodorized synthetic fibers have.
It neutralizes alkaline smells like ammonia and also helps to neutralize other odors because of its high ability to absorb humidity.
Natural UV Protection (UPF50+)
This bamboo polyester material has a natural UV protection of UPF50+, keeping you well protected against ultraviolet rays when on the move.
Turn the collar up to warm up your neck
On a chilly morning or late evening, turn up your collar and secure it with the added button to keep out the chill. A turned-up collar also helps to prevent your neck from getting sunburned when the sun is up.
Wrinkle-resistant, cool material
The 50/50 bamboo/polyester blend has a unique cool, silky texture that doesn’t wrinkle easily even if stuffed somewhere in your backpack. The polyester also adds a nice glossy shine to the fabric making you stand out on the trail.
Form follows function
We wanted to make a simple shirt easy to use and with great ventilation. The unique bamboo/polyester blend is more windproof and dries faster than most other shirt cut-and-sew fabrics. We chose snap buttons to make the buttoning and unbuttoning as fast and easy as possible. The cut is wide to allow for ample ventilation.
We decided on an open-necked turndown collar without a neckband to avoid trapping heat around your neck when moving, while still allowing you to turn up your collar and secure it in the cold, making this shirt work in a wide range of temperatures.
We didn’t feel the need for pockets, so left these out on purpose.
Bamboo, a natural fiber, has excellent humidity absorbency, deodorizing properties, and block-out ultraviolet rays on par with wool. The weakness is that it is not that strong. Blending it with polyester, which has excellent durability and fast-drying properties, helped us achieve a material that can withstand rough handling when hiking and is comfortable to wear.
The bamboo fibers have a light, durable, and flexible feel. Traditionally bamboo has been widely used in Asia in a variety of products from food packaging to woven goods. Bamboo also grows extremely fast and can be harvested after only 2-3 years so is a very environmentally sound material.
Bamboo Polyester (50% Rayon, 50％ Polyester)
Tear strength measured by JIS L 1096 D (In-house test)
Vertical: 1.9kg, Horizontal: 1.5kg
Tensile strength measured by JIS L 1096 A (In-house test)
Vertical: 58.4kg, Horizontal: 35.7kg
Breathability measured by JIS 1096 A (In-house test)
- Machine wash below 40°C.
- Wash separately or use laundry net bag.
- Tumble dry below 60°C.
- Line dry in the shade.
- Do not bleach and do not use fabric softener.
- Iron on low, cover the pants with a cloth. Do not steam.
- The material, made from natural bamboo fibers, may get fuzzy and white marks due to friction with your backpack.
- We only accept payment by credit card. We currently do not accept payment via bank transfer from overseas accounts.
- We accept the following Credit Cards: Visa, Master, American Express, and JCB.
- To download your receipt, please click the link included in the Dispatch Notice, which we will send by email as soon as the items are dispatched.
We will ship by DHL for overseas customers (excluding China, Hong Kong, Taiwan, Korea and Russia). For customers in China, Hong Kong, Taiwan, Korea and Russia, we will ship by EMS only. Shipping costs vary depending on your country and region.
- Overseas customers who need to change the size of their order, should note that the time needed for shipping will vary greatly depending on your country of residence.
- We only accept exchanges when the item is unused (except for fitting).
- If you wish to exchange the size of the item, please contact us within seven days of receiving your order.
- Exchanges can only be made for the same color in a different size.
- If the size you wish is out of stock, we will suggest a different color.
- If the product is out of stock, we may simply have to ship the item back to you.
- All shipping costs to be carried by the customer.
- We will only send the exchanged item to you, upon receipt of return shipping cost via PayPal.
- Please be aware that some countries charge customs duties depending on the price of the item.
- We are unable to answer any questions on local customs. Please contact your local customs bureau.
We accept repairs for all of our Yamatomichi products. For inquiries on repair services including patching the holes, repairing with extra components, or fixing the items damaged over time, please feel free to contact us from the “Repair” section of the SUPPORT page.