Alpine Protection Without the Weight

The Outdoor Research Alpine AscentShell Bivy is a lightweight, hooped bivy designed for climbers and fast-moving adventurers who need reliable protection without carrying a full tent.

Combining AscentShell™ waterproof-breathable technology with Pertex® durability, this bivy delivers exceptional weather protection while drastically reducing condensation-keeping you dry, comfortable, and ready for the next push.

With its structured pole design, generous headroom, and smart step-in entry, it offers real shelter performance in a compact, minimalist package.

Why You'll Love It

AscentShell™ waterproofing - Highly breathable, storm-ready protection
Ultra-lightweight design - Ideal for fast & light missions
Hooped structure - Increased space and comfort
Reduced condensation - Sleep drier in tough conditions
Compact & packable - Replace your tent when weight matters

Built for Alpine & Fast & Light Missions

Perfect for:

Alpine climbing
Mountaineering
Fastpacking
Solo missions
Minimalist adventures

Designed for when every gram matters but protection is essential

Performance Features

AscentShell™ Waterproof & Breathable Fabric

Advanced 3-layer construction

Provides:

Waterproof protection in harsh weather
Exceptional breathability
Significantly reduced condensation

Lightweight Fast & Light Shelter

528g with pole / 479g without

Benefits:

Minimal pack weight
Ideal for alpine pushes
Easy to carry on long approaches

Hooped Design with Increased Headroom

Structured pole system

Improves:

Internal space
Comfort when sleeping
Room for small gear storage

Step-In Entry System

Easy access design

Allows:

Quick entry after long days
No awkward repositioning
Smooth transition from boots to sleep

No-See-Um Mesh Panel

Integrated bug protection

Useful for:

Warmer conditions
Lowland bivy use
Improved ventilation

Optimised Tapered Shape

Designed for efficiency

Best paired with:

Tapered sleeping mats
Max 56cm width at foot

Technical Specifications

Weight: 528g (with pole), 479g (without pole)
Construction: Hooped bivy
Upper Fabric: bluesign® approved AscentShell™ x Pertex® Shield Air Diamond Fuse 3L (100% Nylon)
Floor: 40D Nylon with TPU lamination
Mesh: bluesign® approved 100% Polyester
Waterproof: Yes
Breathable: Yes

Perfect For

Alpine climbers
Mountaineers
Fastpackers
Minimalist adventurers
Solo expeditions