When hiking a steep incline, 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. The fabric’s superior breathability makes the jacket unbelievably comfortable, making it work as a windshell or as a rain jacket.

The UL All-weather Jacket features a chest pocket for stowing the jacket itself and a double zipper design, achieving easy ventilation when you are pushing hard to climb a steep hill. Additionally, the snap buttons on the armholes enable quick sleeve adjustments in warmer conditions or function as thumbholes in colder weather, making it a true “All-weather” jacket.

Rainwear keeps rain out, but it also traps heat. The harder you move, the faster it gets clammy—so when the rain stops, you take it off.

Wind shells are light and breathable, but they are not built for real rain.

For years, hikers had to choose between the two: protection or breathability.

Nanofiber membranes changed that. By allowing air to pass through while keeping water out, they made it possible to create a shell that stays comfortable across changing conditions—not just when it rains.

This is not simply rainwear, and it is not simply a wind shell. It is a new category built for movement in all weather: all-weather activewear.

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.

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.

The large pocket added from the 2023 model, can hold snacks, maps, and other essential items for hiking. It is placed at the front where the usability of the sternum strap is not compromised.

The UL All-weather Jacket can be neatly packed in the large front pocket.

The double zipper allows it to be opened and closed from either the top or bottom for quick ventilation. This ensures you will stay comfortable in the ever-changing mountain conditions, including climbing ridges in high winds after a hard hike up.

Rainwear seams are usually sealed from the inside with seam tape, but over time, that tape can peel or weaken, creating a risk of water entering through the seams.

For the UL All-weather Jacket, we use ultrasonic welding instead. This process uses ultrasonic vibration to generate heat, melting and bonding the fabric without needle holes. It causes less damage to the fabric and helps reduce the risk of water entering through the seams after years of use.

Only a limited number of factories in Japan can perform ultrasonic welding at this level of precision. At our partner factory in Akita Prefecture, years of research and refinement have made it possible to combine the strength and waterproofness needed for hard use in the mountains.

There is a cord lock on the inside of the hood fabric that adjusts the hood. Press the cord lock and pull the cord under the hood to adjust.

Other than the double-zippered “Jacket”, the UL All-weather series includes: The zipperless ultralight “Hoody”, lengthened “Long Hoody”, zippered, pocketed, and packable “Coat”, and a pair of “Pants”. The features of each product are as follows:

• This product is an ultralight waterproof shell made with extremely thin fabric. Watch out for branches and rocks!
• To keep it performing well, you’ll need to take care of it. Sweat, dirt, and body oils mess with the fabric—wash it regularly following the care label.
• The fabric’s super thin and porous, so stuff like vaseline, bug spray, sunscreen, or anything with alcohol can stain it or mess with breathability.

Thicker fabrics tend to hold water-repellent treatments better, but the UL All-weather Series uses ultra-thin, highly breathable outer fabrics to keep things light and airy. That means while the water repellency is solid when shipped, it won’t last as long as heavier waterproof-breathable materials.

When the DWR is working, water beads up and rolls off. Once it starts to wear out, water spreads across the surface like a film, blocking breathability and making the inside feel damp or clammy.

If it feels like the water repellency is fading, toss it in the dryer or hit it with a hairdryer after washing—it’ll help bring it back. If that doesn’t do the trick, reapply a water-repellent treatment using a product from your local gear shop.

This shell is built for comfort while you’re on the move in mild conditions. It doesn’t insulate like heavier waterproof or winter shells, so when you stop or need extra warmth, make sure you’ve got the right layers.

If you’re heading into harsh environments, don’t take it lightly—plan your layering accordingly.

• 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.
• Close the zipper when washing.
• 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. For removal methods, please refer to the our Journal; #2 – Removing stains from rainwear.

Care 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.

• 本製品は極薄の防水透湿生地による超軽量防水シェルです。岩の擦れ、木々の引っ掛け等による破損、破れにはご注意ください。
• 防水透湿性能を最大限に発揮させるために、着用後のケアが必要となります。メンブレンと生地表面の撥水加工、生地内側のレイヤーはそれぞれ汚れや汗、皮脂などが付着すると性能が損なわれます。洗濯表示に従いこまめに洗濯してください。
• 非常に軽量で薄い多孔質素材のため、ワセリンや防虫成分、エタノールが含まれている製品（ヘアクリーム、化粧品、日焼け止め、防虫剤等）が生地に付着することにより、シミが発生したり透湿機能が低下したりする可能性があります。

撥水の持続性能は、生地が厚いほど撥水剤の浸透する量が多くなり、高くなると言われていますが、UL All-weatherシリーズは軽量性と通気性を重視するために、できるかぎり薄い通気性の高い表地を採用しています。そのため、出荷段階で撥水性能は十分に持たせてありますが、撥水持続性能は厚手の透湿防水素材と比べて低くなっています。

撥水機能が効いているうちは生地表面に付着した水分は水滴になって落ちますが、弱まると水膜のように生地表面を覆い透湿性能を損ない、ウェア内部が蒸れたり結露によって濡れたりする場合があります。

撥水性が低下したと感じたら、洗濯後に乾燥機やドライヤーなどで熱を加えることで撥水性を復活させることができます。それでも撥水性が回復しない場合は、市販の撥水剤による撥水ケアを行ってください。

本製品は、比較的温暖な環境下での行動時に快適に着用できるよう設計されており、一般的な重量の防水シェルや冬季用のハードシェルと比べると、保温性は劣ります。そのため、停滞時や保温性を重視したい場面では、適切なレイヤリングの工夫が必要となります。また、過酷な環境下での使用に際しては、十分にご注意ください。

レイヤリングについては、本ページ上部の「レイヤリング提案の紹介」で詳しくご紹介していますので、ぜひ参考にしてください。

• 洗濯は水温30℃以下の弱水流コースで行ってください。
• レインウェア専用洗剤もしくは漂白・柔軟・蛍光増白剤不使用の中性洗剤をご使用ください。
• 洗濯は単体かネットに入れて行なってください。
• 洗濯はファスナーを閉めて行ってください。
• ひどい汚れは水で薄めた洗剤を塗布して柔らかいスポンジで部分洗いしてください。表面の接ぎ目や裏面のシームテープは擦らないでください。
• 定期的に乾燥機の低温設定（上限60℃）で乾燥させて撥水性を復活させてください。
• 柔軟剤、漂白剤は使用しないでください。
• アイロンはスチームは使わず低温でかけてください。
• ドライクリーニングは行わないでください
• ワセリンや防虫成分、エタノールが含まれている製品（ヘアクリーム、化粧品、日焼け止め、防虫剤等）が生地に付着することにより、シミが発生したり透湿機能が低下したりする可能性があります。その除去方法について、山と道JOURNALS『山と道修理部通信#2 レインウェアの油脂汚れをきれいにする』でご紹介しておりますのでご参照ください。

SUPPORT「製品ケア」をご確認ください

さらに詳しい洗濯や乾燥方法、撥水ケアについては、SUPPORT「製品ケア」内、UL All-weather seriesのページで写真や動画を交えて紹介しています。正しくケアを行うことで製品の機能や性能をより長く保つことができます。ぜひ参考にしていただき、末長くご愛用いただければ幸いです。