Mountain Equipment Helium 800 Sleeping Bag: 3F Down

Part of Mountain Equipment's Helium collection of lightweight alpine-inspired bags the Helium 800 Sleeping Bag maximizes warmth-to-weight when you're sleeping outside in cold dry conditions inherent to high-altitude climates. Mountain Equipment rates it down to 3-degrees Fahrenheit ensuring you'll stay toasty in sub-freezing temperatures at higher altitudes and overnight outings in wintertime. 700-fill pure duck down insulation provides thermal efficiency on those freezing nights at altitude and ensues compressibility when pack space is a premium commodity such as extended backcountry missions. The Helium 20D shell fabric shaves excess bulk from this sleeping bag and breathes well overnight--all without sacrificing much in the way of durability. Slanted box-wall baffles prevent down migration issues and provide thermal efficiency to keep cold spots from stealing precious body heat. Additionally you'll find a full-length Gemini zip baffle and integrated collar with locking closure to prevent heat loss when temperatures plunge overnight.