Alpine AscentShell Bivy

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Alpine protection and all-night comfort without the weight. Lightweight durability of Pertex® and breathable waterproof AscentShell™ makes for a faster and lighter solo shelter that you’ll bring everywhere. 

Solo adventuring just got a whole lot more comfortable and convenient. 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 any time you want to skip the weight and bulk of a tent.

The tapered shape of the Alpine AscentShell Bivy works best with tapered-shape sleeping pads with narrower dimensions at the foot, ideally 22 inches or narrower.


Outdoor Research
Mfg Sku/Part Number:
-- 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
18.6oz / 528g with pole, 16.8oz / 479g without pole
Top of Bivy Width:
28 in.
Foot of Bivy Width:
22 in.
83 in.
Top of Bivy Height:
20 in.
Fabric Performance:
  • Waterproof
  • Breathable
  • Ultralight
  • Fully Seam-Taped
  • Durable
  • No-See-Um Mesh
Design Features:
  • Single-Pole System
  • Two Stake Loops
  • One Guy Line Loop
  • High Volume Toe End
  • Extra Headroom to Store Gear
  • Large Side Opening
  • Fly Fastener Exposes Mesh Screen
  • Extra Large Mesh Screen for Stargazing

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