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Inferno Sleeping Bag: -40F Down
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Inferno -40F Sleeping Bag delivers expedition-grade warmth for the harshest environments
What Our Gearhead® Experts Are Saying:
"I’ve used a lot of cold-weather bags, but this is the one I’d trust above tree line when the forecast turns ugly. The waterproof shell is a lifesaver on long expeditions, and the heat retention is unreal—you crawl in shivering and thaw out fast."
When we’re planning missions where retreat isn’t an option—high-altitude summits, deep-winter expeditions, or extended Arctic travel—we count on the Inferno -40°F Sleeping Bag to safeguard our recovery each night. The 800-fill ProDown lofts quickly and traps heat even in damp environments, while a rugged, waterproof shell resists frost, tent condensation, and blowing snow when the weather turns hostile.
A classic mummy silhouette maximizes thermal efficiency and makes it easier to pack the bag down in the morning before we load our sled or haul bag. The half-length zipper cuts weight while allowing quick venting during warm spells, and a compression sack keeps the whole system compact enough for expedition travel. With reinforced panels at the head and footbox and attachment points to keep it secured to a sleeping pad, the Inferno is engineered for life well below zero.
Details
- -40°F down bag built for severe alpine and polar conditions
- 800-fill ProDown provides high warmth with reliable loft in damp air
- Waterproof shell fabric shields insulation from frost and snow
- Mummy design traps heat efficiently and packs down small
- Internal pocket keeps essentials accessible through long nights
- Compression stuff sack included for streamlined expedition packing
- Item #TNFZDY8
- Responsible Collection
- Recycled/Repurposed, Responsibly Sourced
- Material
- [face fabric] 15D recycled nylon, XReflex coating, [head, footbox] 15D recycled nylon ripstop, [lining] 30D nylon taffeta
- Insulation
- 800-fill ProDown
- Shape
- mummy
- Zipper
- 1/2-length
- Max User Height
- [regular] 6ft, [long] 6ft 7in
- Shoulder Circumference
- [regular] 64in, [long] 66in
- Hip Circumference
- [regular] 60in, [long] 62in
- Foot Circumference
- 44in
- Bag Length
- [regular] 78in, [long] 84in
- Draft Tube
- yes
- Pockets
- zippered internal
- Pad Retainer
- shockcord attachment
- Venting
- 1/2-length zipper
- Degree
- -40F
- Storage Sack
- included
- Stuff Sack
- compression
- Stuff Size
- 12 x 12 x 16in
- Claimed Weight
- [regular] 3lb 9oz, [long] 3lb 11oz
- Activity
- mountaineering, winter camping
- Manufacturer Warranty
- lifetime
Shaping the Future of Human/Nature
Since 1966, The North Face has been dedicated to pushing the limits of exploration. What began in San Francisco as a small mountaineering shop has grown into a global brand, known for innovative gear, sustainable practices, and a deep commitment to the outdoors. Guided by the belief that exploration is our oxygen, The North Face empowers athletes, adventurers, and communities worldwide to go beyond the map. Through groundbreaking design and a higher calling to protect the planet, the brand continues to inspire and equip every journey.