Mountain Hardwear Phantom GORE-TEX Sleeping Bag: -40F Down

Phantom GORE-TEX Sleeping Bag delivers -40°F warmth, RDS-certified down, and ultralight protection for extreme conditions

What Our Gearhead® Experts Are Saying:

“This bag is built for the coldest alpine conditions. The 800-fill RDS-certified down delivers incredible warmth without excess weight, and the GORE-TEX shell keeps moisture out while remaining breathable. The contoured footbox, draft collar, and down-filled face gasket trap heat efficiently, so I stay warm even in extreme temperatures. Whether I’m on a high-altitude expedition or winter camping, this bag is my ultimate protection against the cold.”

When temperatures plunge to extreme lows, we need a sleeping bag that guarantees warmth, protection, and comfort. The Mountain Hardwear Phantom GORE-TEX Sleeping Bag is built for the harshest alpine environments, offering -40°F-rated insulation with 800-fill RDS-certified down. The ultralight yet highly protective GORE-TEX shell repels moisture while remaining breathable, ensuring we stay warm and dry in the most unforgiving conditions.

Designed with high-alpine expeditions in mind, this bag features a contoured footbox for natural positioning, a four-chamber hood for even loft, and a draft collar to prevent heat loss. A two-way zipper allows for ventilation when needed, while the lightweight compression sack makes it easy to pack down for backcountry travel. Whether summiting remote peaks or winter camping in deep snow, the Phantom is the last line of defense against extreme cold.

Details

• Extreme-cold sleeping bag designed for alpine expeditions and winter camping
• 800-fill RDS-certified goose down provides high-loft warmth with minimal weight
• GORE-TEX shell repels moisture while maintaining breathability for dry comfort
• Draft collar, down-filled face gasket, and contoured footbox trap body heat
• Angled baffles and four-chamber hood ensure even insulation distribution
• Two-way zipper allows for adjustable ventilation and easy entry/exit
• Lightweight compression sack and mesh storage sack included for travel-ready packing
• Item #MHWZAF9

Tech Specs

Material

[membrane/laminate] GORE-TEX Windstopper (2-layer), [face fabric] 30D nylon ripstop, [lining] 20d nylon taffeta

Insulation

850-fill down

Shape

mummy

Max User Height

[regular] 6ft, [long] 6ft 6in

Shoulder Circumference

66in

Hip Circumference

62in

Foot Circumference

[regular] 49in

Bag Length

[regular] 89in, [long] 95in

Degree

-40F

European Norm/ISO Comfort Rating

13F°

European Norm/ISO Lower Limit Rating

0F°

Storage Sack

included

Stuff Sack

included

Stuff Size

8 x 15in

Claimed Weight

[regular] 4lb 10oz, [long] 4lb 10.9oz

Activity

backpacking, mountaineering, winter camping

Manufacturer Warranty

lifetime