92g (Size S)
99g (Size M)
109g (Size L)
118g (Size XL)
- Introduction
- UL Shirt with pockets
- Product story
- A Four-year journey
- Form and function
- Two large pockets
- Refined wide silhouette
- Lighter than a T-shirt
- Trail Shirt
- Wrinkle-proof
- Super compact
- Raised collar for extra warmth
- Fast-drying
- Comparing Yamatomichi trail shirt fabrics
- Material
- Shadow Rip: lightweight, strong, durable
- Size guide
- Instructions
- Care instructions
- Repair
Introduction
UL Shirt with pockets
Building on the versatility of our UL Shirt, the UL Big Pocket Shirt adds two chest pockets for trail essentials, carefully placed so they won’t interfere with pack straps. The fit is a touch roomier than the original, with a redesigned pattern that keeps the silhouette sharp.
A wide cut and open collar let air flow on warm days, while snap buttons give you instant ventilation when the trail heats up.
With UV protection, wind resistance, and breathable comfort, it works as a sun shirt, windbreaker, and town shirt all at once.
Product story
A Four-year journey
Designing a shirt that carries large, practical pockets and a relaxed silhouette, yet stays clean under a backpack, was no easy task.Here, founder Akira and pattern maker Hirotomo look back on the process that brought it to life.
Akira: In our Trail Shirt series, including the UL Shirt, we deliberately avoided adding pockets. Customers often asked for them, but at the time we prioritized lightness above all. Adding pockets would reduce the breathability and blur the concept we were pursuing, so we resisted the idea for years.
But time has passed since the UL Shirt’s release, and I began to feel it was time to offer something different. That’s when we decided to take on the challenge of making a pocketed version of the shirt.
Hirotomo: Yamatomichi products have always been defined by simplicity — lightweight materials and a clear concept. At first, the idea of adding pockets to a shirt seemed to go against that spirit. But over time, I found myself drawn to the practicality they offered. I also knew that Akira had been wrestling with this dilemma for years.
Small pockets would only serve as decoration, while adding flaps or zippers risked complicating the design. To find the right approach, Akira and I built prototype after prototype, trying different fabrics and pocket styles, often abandoning them along the way. Looking back, those abandoned attempts became essential groundwork for what eventually emerged.
Akira: From the outset of revisiting the UL Big Pocket Shirt, the decision was clear: two large chest pockets would be part of the design. What wasn’t clear was how long the journey would take. Four years passed between that decision and the product’s release came far longer than expected.
Hirotomo: As with many of our projects, this one certainty took time. To reach the point of “this is it” required patience and iteration.
Akira: The biggest challenge was ensuring the silhouette remained elegant. We wanted something with a new pattern altogether, and so began experimenting with big-silhouette concepts.
Hirotomo: Because of the large pocket size, balance was everything. A shirt designed in the usual way would never work. The pattern had to be reimagined from scratch, and at times the prototypes looked more like jackets than shirts. It was an endless cycle of trial and adjustment
Akira: When the samples were finally tested in the field, the practicality of the pockets was undeniable. Having maps, tickets, or small items at hand proved surprisingly useful — both on the trail and while traveling.
Hirotomo: Pocket placement became another puzzle. They needed to sit low enough to be accessible even with a sternum strap fastened, but not so low that they disrupted the design. Countless adjustments were made before it felt right.
Akira: What took the most time, however, was the silhouette. Early prototypes had a big, relaxed shape that looked fine on its own but collapsed under the weight of a backpack. That wasn’t acceptable. Yamatomichi makes gear for hiking, and a shirt should look as good with a pack on as without. That realization set us on a new path: how to preserve the wide look while keeping the lines sharp with a pack.
Hirotomo: It wasn’t about simply adding fabric. If it looked like someone had just gone up a size, the concept would be lost. The shirt’s very structure had to be reconsidered. The final solution gave the upper chest a light, airy feel for ventilation, while tapering toward the hem for a clean finish.
Akira: Throughout the process, we reminded each other of the goal: to create a shirt unlike anything that had existed before.
Hirotomo: It was an ambitious challenge, and the results reflect that. The silhouette that emerged was something entirely new. Sleeve lengths, measurements, and comfort were refined again and again, until the balance was right.
Akira: There were at least three moments when I believed the shirt was complete, only to return to the drawing board. By the time it truly felt finished, four years had slipped by.
Hirotomo: The result isn’t a “big silhouette shirt” in the usual sense, nor is it oversized by the numbers. But when worn, it carries a sense of volume, while still allowing a backpack to sit cleanly and look sharp. Achieving that balance was a moment of real satisfaction, proof that the long process had been worthwhile. And yet, even now, it feels like the journey may not be over.
Akira: (Nods in agreement) Perhaps it isn’t.
Form and function
Two large pockets
Spacious enough to hold trail maps, a notebook, a hand towel, or even a pack of cigarettes, the dual chest pockets keep small essentials within easy reach. The lightweight fabric makes them ideal for lighter items, though heavier objects like a wallet or snacks should be carried with care.
Size M
Refined wide silhouette
Cut with extra room at the shoulders and arms and tapered toward the hem, the shirt offers the ease of a wide silhouette while holding a crisp, balanced line. Even under a backpack, the shape stays streamlined and composed.
Lighter than a T-shirt
At only 87g in size XS, we’ve created a shirt that is lighter than a T-shirt. The fabric uses the strong but ultralight Teijin Shadow Rip, only weighing about 56g/㎡, achieving both breathability and durability.
Trail Shirt
Woven fabric, which is often used as a material for shirts, is densely woven by warp and weft yarns. As a result, for the same weight and material, it is usually more windproof, dries faster, and is more durable than knitted fabrics, which are commonly used for base layers.
Furthermore, the UL Shirt adopts the basic “shirt” design, allowing for good ventilation by opening the front buttons. The essence of the shirt, the wind-protective fabric, and the good ventilation is namely the key feature of our hiking trail shirts.
An open-collared shirt offers good ventilation.
Snap buttons allow for speedy opening and closing while on the move.
The hem has slits on both sides, while the tail is slightly longer in the back than the front.
Pivot sleeves with wider underarm panels let the arms move freely without pulling.
A clean placket design without buttons lets the sleeves roll up effortlessly.
Wrinkle-proof
Even after tightly shoved into a backpack or squished into a pocket, the UL Big Pocket Shirt made of Shadow Rip rarely wrinkles and is always ready to be worn.
Super compact
The shirt is so compact it fits in the palm of your hand when folded, making it perfect as a change of clothes when hiking or traveling.
Raised collar for extra warmth
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.
Fast-drying
The UL Big Pocket Shirt is as fast-drying as the highly wicking base layers.
Moisture Content after 15 min of Spin-dry
The chart shows the moisture content in the Shadow Rip fabric after 15 minutes of drying. It compares our shirt with the base layers of a major manufacturer, as well as our merino wool products and a standard cotton shirt.
Comparing Yamatomichi trail shirt fabrics
The Trail Shirt series comes in three different fabrics, each with its own character.
The UL Shirt and UL Big Pocket Shirt use 100% polyester Shadow Rip. This fabric is all about light weight, fast drying, and wrinkle resistance. The tradeoff is that it offers less in terms of odor control, moisture regulation, and insulation.
The Bamboo Shirt is made from a 50/50 blend of polyester and rayon derived from bamboo. It’s the most durable of the three and provides excellent UV protection, with decent performance in odor resistance and moisture management. Sitting right between synthetic and natural fibers, it blends the strengths of both.
The Merino Shirt is 100% merino wool, offering natural odor resistance, breathability, and moisture regulation, along with a soft, comfortable feel against the skin. However, it sacrifices some durability and UV protection compared to the others.
- Moisture control: The property of keeping the humidity inside the garment at a constant level, dry when it’s damp, while moist when it’s too dry.
- Breathability: Higher means better ventilation, while lower means it is more wind-protective.
- UV protection: Ability to block the sunlight’s ultraviolet rays.
UL Shirt
Shadow Rip（100% Polyester）
Extremely lightweight, resistant to wrinkling, and highly portable, making it versatile as both activewear and change of cloth. It offers excellent usability and has a soft texture.
UL Big Pocket Shirt
Shadow Rip (100% Polyester)
Retaining the same light weight and soft feel of the UL Shirt, this version adds two large chest pockets. The cut gives extra room through the shoulders and arms, creating a wide yet balanced silhouette that stays clean even under a backpack.
Merino Shirt
100% Merino Wool
Thanks to its high breathability and excellent thermoregulation and moisture-wicking capabilities, it maintains a comfortable environment within. However, in hot enviroments, it may feel warm. It has a slightly firmer texture similar to linen.
Bamboo Shirt
Bamboo Polyester (50% Rayon, 50％ Polyester)
Bamboo Polyester combines the odor-neutralizing and moisture-wicking functions similar to wool with the functionality of polyester (synthetic fiber). Smooth to the touch and excels in sweat absorption compared to the other two products. The shirt becomes more unique in texture and appearance with use.
Material
Shadow Rip: lightweight, strong, durable
In the mountains, where sudden weather changes, sharp temperature swings, gusting winds, and harsh sun are the norm, gear must balance two opposing qualities: breathability and wind resistance. Teijin Frontier’s Shadow Rip fabric meets these demands while also combining light weight with strength.
Most thin, lightweight fabrics rely on a ripstop structure, weaving thick threads in a grid to add durability. But traditional ripstop creates a textured surface, which can snag easily and wear down over time.
Shadow Rip uses fine, high-strength yarns woven into a flat, even surface. The result is a fabric that stays light and strong while resisting snagging and abrasion. It also has a soft handfeel that resists wrinkling and reduces pilling.
With a UPF rating of 30* or higher, Shadow Rip also provides reliable sun protection.
*UPF values vary by color.
Size guide
Size chart
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Weight (kg) | 42~52 | 50~60 | 57~67 | 64~77 | 74~85 |
| Chest (cm) | 78~84 | 80~88 | 84~95 | 92~102 | 100~110 |
Product dimensions
Unit: cm
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Length | 68 | 71 | 73 | 76.5 | 80.5 |
| Shoudler width | 45 | 48 | 50 | 53 | 57 |
| Body width | 51.5 | 53 | 55.5 | 59.5 | 64.5 |
| Hem width | 50 | 52.5 | 55 | 59 | 64 |
| Sleeve length | 49.5 | 55 | 56 | 57.5 | 59 |
| Sleeve opening | 9.5 | 10 | 10.5 | 11 | 11.5 |
| Pocket width | 13.5 | 14 | 14.5 | 15 | 15.5 |
| Pocket depth | 16 | 16.5 | 17 | 17.5 | 18 |
※Due to fabric stretch and sewing discrepancies, there may be differences between actual measurements and the dimensions stated.
※Shrinkage of the fabric may occur with wear and washing, causing dimensions to change over time.
Fitting
Oji 176cm 60kg
Size L (Slate Green)
Oji 176cm 60kg
Size L (Slate Green)
Shiori 167cm 55kg
Size M (Blue)
Shiori 167cm 55kg
Size M (Blue)
Makoto 166cm 55kg
Size S (Slate Green)
Makoto 166cm 55kg
Size M (Blue)
Atsushi 169cm 54kg
Size S (Black)
Atsushi 169cm 54kg
Size M (Sand)
Oji 176cm 60kg
Size M (Blue)
Oji 176cm 60kg
Size L (Slate Green)
Seiichi 177cm 73kg
Size L (Sand)
Seiichi 177cm 73kg
Size XL (Black)
Ryota 185cm 70kg
Size L (Slate Green)
Ryota 185cm 70kg
Size L (Blue)
Kenken 183cm 77kg
Size L (Sand)
Kenken 183cm 77kg
Size XL (Black)
Makoto 166cm 55kg
Size S (Slate Green)
Makoto 166cm 55kg
Size M (Blue)
Atsushi 169cm 54kg
Size S (Black)
Atsushi 169cm 54kg
Size M (Sand)
Oji 176cm 60kg
Size M (Blue)
Oji 176cm 60kg
Size L (Slate Green)
Seiichi 177cm 73kg
Size L (Sand)
Seiichi 177cm 73kg
Size XL (Black)
Ryota 185cm 70kg
Size L (Slate Green)
Ryota 185cm 70kg
Size L (Blue)
Kenken 183cm 77kg
Size L (Sand)
Kenken 183cm 77kg
Size XL (Black)
Kotone 153cm 44kg
Size XS (Black)
Kotone 153cm 44kg
Size S (Slate Green)
Saki 156cm 48kg
Size XS (Blue)
Saki 156cm 48kg
Size S (Sand)
Miho 159cm 51kg
Size XS (Black)
Miho 159cm 51kg
Size S (Slate Green)
Haruka 163cm 51kg
Size S (Sand)
Haruka 163cm 51kg
Size M (Blue)
Shiori 167cm 55kg
Size S (Slate Green)
Shiori 167cm 55kg
Size M (Black)
Kotone 153cm 44kg
Size XS (Black)
Kotone 153cm 44kg
Size S (Slate Green)
Saki 156cm 48kg
Size XS (Blue)
Saki 156cm 48kg
Size S (Sand)
Miho 159cm 51kg
Size XS (Black)
Miho 159cm 51kg
Size S (Slate Green)
Haruka 163cm 51kg
Size S (Sand)
Haruka 163cm 51kg
Size M (Blue)
Shiori 167cm 55kg
Size S (Slate Green)
Shiori 167cm 55kg
Size M (Black)
Instructions
Care instructions
- Use a neutral detergent and wash at 40°C or lower.
- Wash separately or use a laundry net bag.
- Line dry in the shade.
- Tumble dry below 60°C.
- Do not bleach and do not use fabric softener.
- Iron on low. Do not steam.
- Do not dry-clean.
Care instructions page
For detailed tips on how to wash, store, and take care of your gear, visit our Care Instructions page.
Payment
- 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.
- Bank transfer is only availble for those that own a Japanese bank account.
Delivery
- Order Confirmation will be sent after the order.
- The items will be dispatched within 3 days after the payment is confirmed.
- The dispatch notice will be sent by email as soon as the items are dispatched.
- The delivery may be delayed by unforeseeable reasons such as natural disasters and other logistics issues. We appreciate your patience and understanding.
- We cannot ship multiple orders in one package due to how our delivery system is currently set up.
- We will ship to regions in North America, Oceania, and Europe (excluding Russia) via DHL. For regions in Asia, the Middle East, Central and South America, Africa, and Russia, we use EMS (International Express Mail Service) for shipping.
- Shipping fees and delivery times vary depending on the shipping destination as well as the size and weight of the items.
Size exchange
- 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.
Repair
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.