Outdoor Research Alpine AscentShell Bivy Nimbus

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Outdoor Research Alpine AscentShell Bivy Nimbus


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 anytime you want to skip the weight and space of a tent.



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 with pole, 16.8oz without pole/528g with pole, 479g without pole



Fabric Performance

Fully Seam-Taped
No-See-Um Mesh

Design Features

Single-Pole System
Two Stake Loops
One Guy Line Loop
High Volume Toe End
Extra Head Room to Store Gear
Large Side Opening
Fly Fastener Exposes Mesh Screen
Extra Large Mesh Screen for Star-gazing


Top of Bivy width: 28"
Foot of Bivy width: 22"
Length: 83"
Top of Bivy Height: 20"



 Please Note:  Never completely enclose yourself in any Bivy or tent.  Always leave about 6 inches opening to avoid suffocation.