Outdoor Research Alpine AscentShell Bivy

The Outdoor Research Alpine AscentShell is a lightweight, hooped bivy bag which incorporates breathable and waterproof AscentShell material.

The Outdoor Research Alpine AscentShell Bivy provides Alpine protection and all-night comfort without the weight.
The lightweight durability of Pertex® and breathable waterproof AscentShell™ makes for a faster and lighter solo shelter that you’ll take everywhere.
The tapered shape of the Alpine AscentShell Bivy works best with tapered shape sleeping pads with narrower dimensions at the foot, ideally 56cm or narrower.

Building on the reputation set by the cult-classic Alpine Bivy, this new version leverages AscentShell™ x Pertex® technology for a drastically improved breathability rating which leads to less condensation and a more comfortable sleep. Its step-in opening allows you step directly out of your boots and into your bed easier and without the fuss of shimmying. Extra large head space makes room for gear, and a no-see-um mesh comes in handy when the bugs are out for blood. This bivy is ideal for alpine pursuits, extreme weather, or anytime you want to skip the weight and space of a tent.

Product SKU:  287711
Fabric :
bluesign® approved AscentShell™ x Pertex® Shield Air Diamond Fuse 3L 100% Nylon Upper. 100% Nylon 40D with TPU lamination Floor. bluesign® approved 100% Polyester Mesh
Weight :
528g with pole, 479g without pole

Weight EMS Office Scales:
502 grams + pole 53 grams + Stuff Sack 16 grams = Total Weight 571 grams.

AscentShell is an Outdoor Research exclusive, proprietary fabric that’s a waterproof, breathable three-layer fabric that broadens your comfort zone during aerobic effort throughout changing conditions. It’s created by an electro-spinning process where charged polymers are affixed to a grounded surface. Those polymers gather into a breathable membrane that, under a microscope, you can see forming a web that allows sweat vapours out but stops water from coming in.
This process also allows all AscentShell™ gear to be soft to the touch and keep a great mechanical stretch while remaining waterproof. That’s why we keep talking about Active Waterproof Stretch.
Today, you can find AscentShell™ in some of our best-selling and top rated Bivy Bags and hard shell jackets that run the gamut of outdoor activity.