Gear
Mountain Hardwear Phantom GORE-TEX -40
High-altitude mountaineering and exposed winter bivouacs
Expert reviewed
Topic summary
High-altitude mountaineering and exposed winter bivouacs
Key takeaways
- 800-fill down
- GORE-TEX WINDSTOPPER shell
- expedition mummy design
- Strong warmth, proven expedition geometry and a protective shell make it a compelling technical option.
Verification notes
Evidence: expert reviewed. Last verified July 16, 2026.
Editorial take
Mountain Hardwear Phantom GORE-TEX -40 is a cold-weather sleeping bag with an advertised -40°F rating and 800-fill down; GORE-TEX WINDSTOPPER shell; expedition mummy design. It is best suited to high-altitude mountaineering and exposed winter bivouacs.
Not ideal for
- Premium price and heavier than less weatherproof down bags.
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Verified specifications
- Key features
- 800-fill down
- GORE-TEX WINDSTOPPER shell
- expedition mummy design
Warranty and repair information: contact Mountain Hardwear directly for the most current terms.
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Data sources & verification
- Last verified: 7/16/2026