Marmot CWM Sleeping Bag
Best extreme cold protection for high altitude mountaineers and polar explorers.
Built for the death zone, this bag is a fortress against the planet's most brutal cold. It prioritizes absolute thermal security and moisture management, ensuring that even in sub-zero, high-altitude conditions, the insulation stays dry and lofted for a reliable night's sleep.
$928.95
In stock
at
Backcountry
More CWM options
Who it's for
- High-altitude mountaineers facing extreme sub-zero temperatures
- Expedition climbers needing reliable protection from moisture and wind
- Polar explorers requiring rugged gear for demanding arctic environments
Who should skip it
- Backpackers prioritizing minimal weight and low-volume gear setups
- Casual winter campers seeking a more affordable entry-level option
- Three-season hikers who need a versatile bag for varying climates
Performance breakdown
Thermal Insulation
800-fill goose down provides unmatched warmth for life-threatening sub-zero conditions.
Moisture Protection
Pertex Shield shell effectively seals out snow and condensation in damp environments.
Cold Spot Prevention
Cross-baffle construction keeps insulation locked in place to eliminate freezing gaps.
Weight-to-Warmth Ratio
Substantial protection comes with a heavy footprint for long-distance alpine treks.
Ergonomic Design
Adjustable hood and draft collar create a secure, customizable seal against wind.
Durability
Rugged 30D nylon construction withstands the harsh abuse of high-altitude mountaineering.
Key Specs
Temperature Rating
-40F
Insulation
800-fill Power Goose down
Shell Material
Pertex Shield 2L, 30D Nylon
Lining Material
Pertex Microlight 30D Nylon
Shape
Mummy
Weight
4.97 lbs (Regular)
Max User Height
78 inches
Zipper Location
Left or Right
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