Men's Helium AscentShell Jacket

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.
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Men's Helium AscentShell Jacket

Regular Price $574.95 Sale Price: $431.21 (Save 25%)

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.


Product :

Fabric :
bluesign® approved AscentShell™ x Pertex® Shield Air Diamond Fuse 3L, 100% Nylon 30D Ripstop with 7D Tricot Backer.

Center Back Length :
31.5 in

Weight :
11.5 oz/326 g


Fabric Performance
Fully Seam-Taped
Air Permeable

Design Features
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


Rating and reviews

Technology 1/2


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

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

Men’s Apparel

Measurement shown in: In
33.5”-36” 85-91 36”-38.5” 91-98 38.5”-41.5” 98-105 41.5”-44.5” 105-113 44.5”-48” 113-122 48”-52” 122-132 52”-56” 132-142
26.5”-29”67-74 29”-31.5”74-80 31.5”-34.5”80-88 34.5”-37.5”88-95 37.5”-41.5”95-105 41.5”-45.5”105-116 45.5”-50”116-127
32.5”-35”83-89 35”-37.5”89-95 37.5”-40.5”95-103 40.5”-43.5”103-110 43.5”-46”110-117 46”-49.5”117-126 49.5”-53”126-135
31.5”80 31.5”80 32”81 32.5”83 33”84 33”84 33”84
Arm Length
31.5" 76 32.5" 79 33.5" 81 34.5" 84 35.5" 86 36" 89 36.5" 91
*All sizing is based on your body measurement.
We adjust the garment for intended fit and intended use.

About the fit

  • Next to Skin
  • Trim
  • Standard
  • Relaxed


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