Sea to Summit Alpine Down Sleeping Bag
Best high performance insulation for extreme cold weather mountaineers.
A high-performance winter bag built for extreme cold and mountaineering. It balances a spacious expedition fit with advanced moisture-resistant materials, ensuring reliable warmth and ventilation in the harshest alpine conditions.
$934.00
at
Sea to Summit
Who it's for
- Alpinists seeking maximum warmth without a heavy pack
- Winter campers facing damp or high-altitude conditions
- Expedition travelers needing temperature regulation and mobility
Who should skip it
- Budget-conscious hikers looking for an entry-level winter bag
- Side sleepers or individuals who prefer a spacious interior
- Recreational campers who rarely venture into sub-zero temperatures
Performance breakdown
Thermal Efficiency
850+ fill power down provides elite warmth for sub-zero alpine conditions.
Moisture Management
Treated down and targeted water-resistant zones handle condensation with ease.
Packability
Compresses impressively well for a bag rated to negative twenty degrees.
Ventilation Versatility
Free-Flow zip system offers surprising temperature control during active use.
Expedition Comfort
Generous mummy cut accommodates extra layers and essential gear storage.
Weight-to-Warmth Ratio
High-loft insulation delivers serious protection without unnecessary bulk or weight.
Key Specs
Weight
3.19 lbs
Temperature Rating
-20°F
Compressed Volume
12.6 liters
Insulation
850+ fillpower goose down
Shell Material
Recycled 20D nylon
Shape
Expedition mummy
Water Resistant
Yes
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