Pinnacle alpine protection and all-day comfort without the weight. Lightweight durability of Pertex® and breathable waterproof AscentShell™ makes for fast-and-light performance you'll bring everywhere. See why it's trusted in the harshest environments on the planet.
Expert fitted, tested, and trusted on the West Ridge of K2.
Two powerful technologies fuse into one hard shell that feels good, protects better, and far surpasses the performance of heavier jackets. The lightweight durability of Pertex® Diamond Fuse technology keeps you agile through rugged environments, and the breathable waterproof comfort of AscentShell™ technology lets you move and speed up when precipitation comes down. A high-mobility, low-bulk fit takes up less space in your pack and layers more efficiently with harnesses and backpacks.
Built in collaboration with Outdoor Research alpine ambassadors Emilie Drinkwater and Graham Zimmerman, this hard shell has been tested and trusted in some of the harshest environments on earth, including the world's second highest mountain K2. Find out what makes this alpine shell roof-of-the-world ready when you try it on yourself.
bluesign® approved AscentShell™ x Pertex® Shield Air Diamond Fuse 3L, 100% Nylon 30D Ripstop with 7D Tricot Backer.
Center Back Length :
10.5 oz/298 g
Waterproof Windproof Fully Seam-Taped Breathable Air Permeable Durable Lightweight
Fully Adjustable Helmet Compatible Hood Wire Brim and Hoodlock™ Dynamic Reach™ Underarm Panels External and Internal Chest Pockets High Hand Pockets Placed Above Hip Belt and Harness YKK® Aquaguard® Hand and Chest Pocket Zippers Dual Internal Mesh Stash Pockets YKK® Aquaguard® Vislon Center Front Zipper Double Separating Center Front Zipper Elastic Drawcord Hem Foam Bead Inserts to Keep Hem Under Harness Adjustable Wrist Cuffs
Outdoor Research proprietary Ferrosi Fabric makes up our largest, and most frequently awarded, product collection. It hits the equilibrium of being durable yet lightweight, it’s weather resistant yet breathable, and it’s complete with stretchy, easy-to-layer comfort. The Ferrosi line grows season after season, but is most frequently favorited by climbers and hikers for its jackets, hoodies, pants, and shorts. Ferrosi is truly the “do-it-all” choice for any adventurer looking for a layer that ticks three or more items off the gear list.
bluesign® Approved Materials
Bluesign® is a system that provides safer and more sustainable environments for people to work in and everyone to live in. Simply put, bluesign changes the environmental impact of textiles for good. Outdoor Research products made with bluesign-approved materials have gone the extra step to provide the greatest safety, quality, and integrity of responsible chemicals management. Choose bluesign when you want to make an impact by reducing your impact on the planet.
The Infinite Guarantee®
Outdoor Research® gear is guaranteed to perform throughout the lifetime of the product. Get your gear back on track by filing a claim on our Warranty Page
Have a question? Problem? Other request? We’re here to help you find a solution.
Our customer service is waiting for your call at 855-967-8197, on weekdays Monday-Friday between 8am-5pm PST. If you prefer email, you can send your query to firstname.lastname@example.org
Thanks for getting in touch. We can’t wait to get you back outside with your gear.
Machine wash cold separately, rinse thoroughly. Do not bleach. Do not use fabric softener. Tumble dry low or line dry in shade. Do not iron. Do not dry clean.
Size & fit guide
Measurement shown in:In
Measure under your arms around the fullest part of your chest.
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your leg.
Choose a pair of pants that fits well and true to size, hitting at the top of the foot. Measure the inseam from crotch seam to bottom of the hem.
With your hand on your hip; Place the end of the tape at the center point of the base of neck. Run the tape over your shoulder, along arm to the elbow and end at the meaty part of your hand.
*All sizing is based on your body measurement. We adjust the garment for intended fit and intended use.