C6 DWR
88g (Size L)
- Introduction
- Why is this a Special Offer?
- Product Story
- Form and Function
- All-weather Activewear: A Novel Product Category
- Comparison with general mountaineering rainwear
- Overwhelming Ventilation
- Only 77g
- Advanced Ultrasonic Welding
- Simple and Comfortable
- Precautions
- Water Repellency
- Review
- Material
- Pertex Shield Air
- Size guide
- Instructions
- Please Note
- Care Instructions
Introduction
World's Lightest Triple-layer
When hiking a steep uphill, windy ridgeline, or in the pouring rain, this All-weather Activewear keeps you comfortable anytime, anywhere.
Our All-weather series, using the Pertex Shield Air, is significantly lighter than other conventional breathable moisture-permeable jackets and pants. The fabric’s superior breathability makes the jacket unbelievably comfortable, making it work as a windshell or as a rain jacket.
Weighing only 80g, the All-weather Pants are the world’s lightest rain pants made of three-layer nanofiber fabric. Being slightly slim, surprisingly light, and breathable, they are suitable as windbreaker pants even when sunny. A handy smartphone pocket has been newly added since 2023.
Why is this a Special Offer?
Previous Model
We are offering a 30% discount on the 2021 model All-weather Pants, which does not include the smartphone pocket featured in the current model.
- Restock notifications are turned off for Special Offers.
- :Limited stock depending on the size and color.
- Some Special Offer products may not be available at Yamatomichi Kamakura/Kyoto and dealers due to limited stock.
- Discount rates may vary by dealer.
*Special offer products are either: 1. Products that do not have the most up-to-date specification changes, 2. Products that have been in storage for a certain period or, 3. Products that did not meet the quality criteria for regular purchase.
Product Story
Intriguing New Gear
The UL All-weather series is quite different from your regular rainwear.
It’s best to think of it as a new category of gear altogether. Some caution is needed when using, but if used right it will take you even further.
Makoto Fujiyama, wearing the Navy color.
With proper use, it will bring you overwhelming comfort and joy on your next hike.
I first heard about Pertex Shield Air, the material adopted for the UL-All-weather series, about three years ago. At the time, we were conducting research on rainwear at the Yamatomichi Lab. Interested in our research results, Pertex contacted us and provided us with sample fabrics of the Pertex Shield Air before it was officially released.
Initially, I thought that with Pertex Shield Air I could make new rainwear that was simply lighter and more breathable than the NeoShell (an air/moisture-permeable waterproof fabric).
However, the potential for the fabric was far more profound than that. During a field test I conducted at Taisetsuzan Hokkaido at the end of August, I realized that there was a need to differentiate this amazing fabric from traditional rainwear.
There are no trees on the ridges of Taisetsuzan in Hokkaido, and no place to take refuge. In this environment, with strong winds and light rain, I wore a prototype jacket using Pertex Shield Air and was pleased with the comfort and dryness it provided in active situations. However, I noticed that my body heat was immediately ventilated outside during my breaks.
Rainwear is usually known to protect you from the wind and is able to somewhat retain body heat. The All-weather series is different. It is as if the jacket is telling you “Don’t stop moving!” We can’t deny the benefits it brings in terms of dryness, and breathability, but we also cannot deny the lack of heat retention when resting. In other words, it is difficult to keep warm with this garment alone, especially in bad weather.
To be honest, I was a bit worried. I thought that if the wearer used this fabric without knowing its flaws, it could be truly dangerous.
For ages, I have been wishing for rainwear that could be worn at all times, and rainwear that had a little bit more breathability. I went as far as thinking that fabrics that weren’t breathable were no good. But that was not the case. Excellent breathability will vent the heat out but will lead to less heat retention in bad weather. On the contrary, rainwear with high thermal insulation tends to trap heat and become stuffy during activities.
While it excites me that the gear I wanted to take shape, I also worried at times. I’ve come to realize that the Pertex Shield Pro, the fabric used for our UL Rain series, has a good balance of warmth and breathability.
But in the end, I decided to release this product because I was thrilled that the answer I had been seeking for many years had finally taken shape and because I truly felt from the bottom of my heart that this fabric would make very interesting gear.
Choosing the right gear may differ depending on its purpose. There is no doubt that this is a garment that active hikers and trail runners have been on the lookout for many years, but it may not be the best fit for those who are not looking to stay highly active while hiking.
To conclude, I could have used a lighter material, but since I decided to use the name “All-weather,” I wanted to maintain a certain level of durability and strength, as well as a sense of elasticity, so I was particular about the combination of outer and inner fabrics for the garment. Ultrasonic welding has also evolved.
At first glance, you may think, “What’s changed from the UL Rain series?”
But trust me, they are very different.
Form and Function
All-weather Activewear: A Novel Product Category
The UL All-weather series offers overwhelming breathability compared to conventional rainwear. It has evolved into a new product category we call “All-weather Activewear” equally suitable for sunny and rainy days.
Its excellent ventilation performance lets the heat out and keeps you dry when running or going uphill, even when normal rainwear is too humid and warm to wear. The 10,000mm water pressure resistance will protect you from getting wet in case of sudden rain.
The All-weather series was featured in a three part series on our Journal!
Yamatomichi Lab Special Issue: All-weather Activewear #1-3
Comparison with general mountaineering rainwear
The chart below shows a comparison between the UL All-Weather Series and general mountaineering rainwear (assumed to be products weighing 200-300g that use breathable waterproof membranes such as Gore-Tex).
General rainwear tends to have excellent insulation, but poor breathability and a tendency to trap heat. However, the UL All-Weather Series is lightweight, highly breathable, and does not trap heat even during intense activity.
However, due to its high breathability, the UL All-Weather Series may sometimes make the wearer feel cold in strong winds. Therefore, proper layering is necessary when using it to ensure warmth.
Overwhelming Ventilation
What’s so special about the Pertex Shield Air? It’s a novel nanofiber fabric that is permeable not only by moisture but also by air. This air/moisture-permeability creates a truly unique kind of breathability.
We tested the breathability of the Pertex Shield Air of the UL All-weather series and the existing UL Rain Hoody (PU Shinsui), the Pertex Shield fabric. The test method is as follows:
The test fabric is placed in the middle of the tester. The upper half of the tester has some water in it, while the lower half is empty (filled with air). When the lower half is pressurized by the pump, the fabric lets the air pass, and bubbles are created in the upper half. The more air that passes through, the more bubbles are created. The Pertex Shield with no air-permeability does not generate air bubbles. On the other hand, the Shield Air creates many air bubbles, indicating its high air-permeability.
Only 77g
Weighing only 77g in size S, the All-weather Pants are the world’s lightest rain pants made of three-layer nanofiber fabric.
Advanced Ultrasonic Welding
Usually, the stitching of the rainwear is seam-taped from the back to prevent water penetration. However, seam tape lacks durability, and water may seep through seams due to deterioration over time.
The UL All-weather Jacket adopts ultrasonic welding, the latest technology that melts and welds the fabrics together by the heat of ultrasonic vibration. This method creates no stitch holes with less damage to the fabric, minimizing the risk of water penetration from the seams due to deterioration with age.
Yamatomichi has teamed up with one of a few craftsmen and factories in Akita Prefecture that are capable of ultrasonic welding and is developing new technologies to make better products.
New technology allows the fabric to be layered and then welded together, making it even more durable, stronger, and waterproof than its predecessor, the UL Rain series.
Simple and Comfortable
It has a sleek and slim silhouette with a squeezed hem, making it light, comfortable, and neat. It can be actively worn as wind pants during intense activities or 2nd layer for when not moving.
UL All-weather Series
UL All-weather series has five products: The standard “Hoody”, lengthened “Long Hoody”, double-zippered “Jacket”, zippered and pocketed “Coat”, and a pair of “Pants”. The features of each product are as follows:
UL All-weather Hoody
Weight: 106g (Size S)
Features: The lightest among the series. No-zipper design allows for lightness and comfort.
Application: UL Hiking
Weight: 130g (Size S)
Features: Much lighter than the set of rain jacket and pants. Long enough to wear without rain pants, offering a sense of freedom around the legs.
Application:
Ultralight hiking. The length makes it difficult to see your feet, so use it with caution on rocky ridges.
Weight: 144g (Size XS)
Features: Double-zipper allows for easy ventilation and taking off/putting on
Applicaion: Trail running, fast-packing.
Weight: 192g (Size XS)
Features: Packable with large front pocket. Waterproof Vislon zipper.
Application: Daily use. Ultralight hiking. The length makes it difficult to see your feet, so use it with caution on rocky ridges.
Weight: 77g (Size XS)
Features: Waterproof yet air-permeable. Can be worn on the move even when sunny.
Application: Ultralight hiking. Trail running. Fast-packing.
UL All-weather Hoody
Weight: 106g (Size S)
Features: The lightest among the series. No-zipper design allows for lightness and comfort.
Application: UL Hiking
Weight: 130g (Size S)
Features: Much lighter than the set of rain jacket and pants. Long enough to wear without rain pants, offering a sense of freedom around the legs.
Application:
Ultralight hiking. The length makes it difficult to see your feet, so use it with caution on rocky ridges.
Weight: 144g (Size XS)
Features: Double-zipper allows for easy ventilation and taking off/putting on
Applicaion: Trail running, fast-packing.
Weight: 192g (Size XS)
Features: Packable with large front pocket. Waterproof Vislon zipper.
Application: Daily use. Ultralight hiking. The length makes it difficult to see your feet, so use it with caution on rocky ridges.
Weight: 77g (Size XS)
Features: Waterproof yet air-permeable. Can be worn on the move even when sunny.
Application: Ultralight hiking. Trail running. Fast-packing.
Precautions
Water Repellency
It is said that the thicker the fabric, the more water-repellent agent it contains, so thicker fabrics have a more enduring water-repellent performance. The UL All-weather series, however, uses a very thin, breathable fabric for the surface to maximize lightness and air-permeability. This means that it has enough water repellency when it’s used for the first time, but this gets weakened quicker than other more heavy waterproof jackets.
The All-weather turns the water into droplets and repels them well, but as the water repellency weakens, the water remains on the surface like a water film, hindering the moisture-permeability. Consequently, the moisture builds up inside the jacket, resulting in wetting out.
Thus, the UL All-weather series requires regular maintenance to restore water repellency by washing after the hike to remove dirt and applying heat in a tumble dryer or hairdryer. Water repellency can be restored by the water repellent detergent, if necessary.
Review
Reviews from Yamatomichi staff sharing their firsthand experiences, highlighting the appeal and usability they felt while wearing the product.
This is what freedom of movement feels like! The comfort and lack of discomfort while in motion are exceptional. As for concerns about durability, I've pushed through bushes and bumped against rocks quite a bit, and so far, no issues at all. And above all, the lightweight design is outstanding. There’s absolutely nothing extra—no bottom zippers for easy removal, and no pockets either. At first, I really questioned the lack of a bottom zipper, but after wearing it, I understood why. Once you put them on, they’re so comfortable that you rarely feel the need to take them off. That said, there are limits to comfort. In hot and humid conditions, it does get a bit stuffy.
TJAR2018
These ultralight rain pants weigh almost the same as wind pants. For me, rain pants are something I rarely use. Unless it’s pouring heavily, I often leave my legs exposed and let them get wet. When I do wear rain pants, it’s usually not for warmth but because I’m worried about wet socks leading to blisters. That’s why I prefer something even lighter and more packable, making these pants my go-to choice. Unlike my colleague Hara, I did initially find the lack of ankle zippers a bit inconvenient. However, I agree with the reasoning—these pants are so comfortable that you don’t feel the need to take them off frequently.
Yamatomichi Main Researcher
In charge of research, including materials and the general outdoor market. After working for various design companies, Takahiro participated in the establishment of a marketing company. Currently involved in various research and data analysis. Also works on travel-related tasks such as operating a travel information site (tabinote.jp) and writing guide articles. His favorite style of hiking is walking for 2 days straight with no sleep. Occasionally participates in trail running races.
Rain pants are typically for wet weather, but as the name suggests, Yamatomichi's UL All-Weather Pants are versatile across various conditions.
They perform well in rain and strong winds but also excel in fair weather by preventing my lower body from overheating. My favorite use is at camp—after pitching my tent, I’ll put them on if it’s chilly and often sleep in them inside my sleeping bag.
Lighter than the Light 5-Pocket Pants, they’re easy to carry and work well as long pants. The soft fabric is comfortable enough to wear over shorts for sleeping without any discomfort. Unlike regular rain pants, which can trap heat poorly and feel cold, these pants transfer body heat effectively, making for a warm, comfortable night.
In the morning, they keep my legs dry when packing up in the dew, and once it warms up, I switch to shorts and continue hiking.
While they’re reasonably durable, the ultra-light fabric requires some care, like avoiding rough surfaces. Still, their versatility makes them much more than just rain pants.
Yamatomichi Kamakura Store Manager / Sales
Hidenori grew up in rural Hokkaido. After working for five years as a physical therapist in an orthopedic clinic, he decided to work as a mountain hut caretaker in the Northern Japanese Alps. In 2019, he embarked on a journey of walking the entire length of New Zealand’s “Te Araroa” long trail with his spouse, seeking to fully immerse themselves in nature. This experience led them to embrace ultralight hiking and his current goal is to research and adopt a hiking style that minimizes injuries and environmental impact, so that he can stay as an active hiker even when he ages.
Material
Pertex Shield Air
The Pertex Shield Air is a novel fabric developed by Pertex to further improve water pressure resistance, washing resistance, and overall quality from existing nanofiber membranes.
Nanofiber membranes are net-like structures made of extremely fine polyurethane (PU) fibers that are water repellent (hydrophobic). They have a sponge-like structure with many micropores, allowing the air and moisture to pass through. This air-permeability creates exceptional comfort within the clothes.
The Pertex Shield Air is much lighter than conventional nanofiber fabrics, with a weight of 50g/㎡ to 60g/㎡. For breathability and durability, our proprietary version of Shield Air has 15 denier nylon fabric (40 denier ripstop) as the outer layer and 7 denier nylon as the inner layer. This combination makes it much lighter and more breathable than other nanofiber-based, waterproof moisture-permeable fabrics.
Pertex Shield Air (100% Nylon) 58g/㎡
Facing: 15d/5f+40d/34f, ripstop
Lining: 7d tricot
Coating: C6 DWR
Spec
Tear strength measured by JIS L 1096 D (In-house test)
Vertical: 3.4kg, Horizontal: 3kg
Tensile strength measured by JIS L 1096 A (In-house test)
Vertical: 41.5kg, Horizontal: 30.2kg
Air-permeability measured by JIS 1096 A (Catalog spec)
0.4cc/(㎠・s)
Moisture-permeability measured by JIS L 1099 A-1 (Catalog spec)
10000g/㎡/day
Moisture-permeability measured by JIS L 1099 B-1 (Catalog spec)
40000g/㎡/day
Water pressure resistance measured by JIS L 1092 B (Catalog spec)
10000mm or more
Size guide
Recommended Size
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Height (cm) | 150~161 | 159~167 | 165~175 | 173~180 | 178~185 |
| Weight (kg) | 42~53 | 51~61 | 59~69 | 67~78 | 76~85 |
| Waist (cm) | 60~70 | 68~80 | 74~84 | 82~92 | 90~94 |
Product Size
Uni: cm
| Size | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Pants Length | 102 | 105.5 | 109 | 112.5 | 115 |
| Inseam | 75 | 78 | 81 | 84 | 86 |
| Waist | 66 | 71 | 76 | 81 | 86 |
| Hip | 53.5 | 55.5 | 58.5 | 61.5 | 64 |
| Hemline | 10.5 | 11.5 | 12.5 | 13.5 | 14.5 |
Fitting
Kim 175cm-71kg
Size M (Black)
Kim 175cm-71kg
Size M (Black)
Shiori 167cm-55kg
Size S (Nomad)
Shiori 167cm-55kg
Size S (Nomad)
Ichiro 170cm-56kg
Size M (Mustard 2021)
Ichiro 170cm-56kg
Size L (Nomad)
Kim 175cm-71kg
Size M (Black)
Kim 175cm-71kg
Size L (Navy)
Nacho 180cm-68kg
Size XL (Nomad)
Ichiro 170cm-56kg
Size M (Mustard 2021)
Ichiro 170cm-56kg
Size L (Nomad)
Kim 175cm-71kg
Size M (Black)
Kim 175cm-71kg
Size L (Navy)
Nacho 180cm-68kg
Size XL (Nomad)
Yukari 153cm-47kg
Size XS (Black)
Eriko 158cm-45kg
Size XS (Black)
Eriko 158cm-45kg
Size S (Mustard 2021)
Eriko 158cm-45kg
Size M (Black)
Shiori 167cm-55kg
Size S (Nomad)
Shiori 167cm-55kg
Size M (Blue Gray)
Yumiko 170cm-60kg
Size M (Nomad)
Yumiko 170cm-60kg
Size L (Navy)
Yukari 153cm-47kg
Size XS (Black)
Eriko 158cm-45kg
Size XS (Black)
Eriko 158cm-45kg
Size S (Mustard 2021)
Eriko 158cm-45kg
Size M (Black)
Shiori 167cm-55kg
Size S (Nomad)
Shiori 167cm-55kg
Size M (Blue Gray)
Yumiko 170cm-60kg
Size M (Nomad)
Yumiko 170cm-60kg
Size L (Navy)
Instructions
Please Note
- The UL All-weather product is our ultralight waterproof rainwear made of ultrathin, moisture-permeable fabric. Please handle it with care as it can be torn or ripped when rubbed against rocks or scratched by spiky branches.
- The UL All-weather product is comfortable when you are on the move in a relatively warm environment. However, it is less warm than normal water-resistant jackets or winter hard shells so we strongly recommend you wear a merino wool base layer to keep you warm especially when severe weather is to be expected.
- To maximize moisture-permeability, after-use care is necessary. The performances of the membrane, the performances of the facing and lining can be impaired by dirt, sweat, skin oil, or other substances. Please follow the washing instructions of each product to properly wash, dry, and keep it clean.
- When the surface water-repellent coating is hindered, so is moisture-permeability. If you notice the water repellency has been weakened, tumble dry at low temperature or apply heat by the hairdryer to restore the water repellency. Please note that initial water repellency is meant to be weakened by repeated washing. Use water repellents for regular care.
- The UL All-weather products use ultralight, thin microporous fabric. Vaseline, insect repellent, and ethanol-containing substances such as hair creams, cosmetics, and sunscreens may stain the fabric. They may also hinder the water-permeability of the fabric.
Care Instructions
- Machine wash, gentle at 30°C.
- Use rainwear-specific detergent or a neutral detergent that does not contain bleaching, softening, or brightening agents.
- Wash separately or use a laundry net bag.
- Apply detergent diluted with water and wash with a soft sponge if badly stained. Do not scrub the surface joints or the seam tape on the back.
- If necessary, tumble dry the garment at a upper limit of 60°C to restore water repellency.
- Do not bleach and do not use fabric softener.
- Iron on low. Do not steam.
- Do not dry-clean.
- Vaseline, insect repellent, and ethanol-containing substances such as hair creams, cosmetics and sunscreens may stain the fabric. They may also hinder the water-permeability of the fabric.
Care Instruction Page
For more detailed washing, drying and water repellent care instructions, visit our SUPPORT Page. With proper care you can prolong the funtionality of the product.
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.
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.