This is an incredibly weather-resistant bag, they use their MemBrain waterproof and breathable 2-layer 30D Pertex Shield ripstop nylon 2.3 oz/yd. So the quality fill inside is fully protected. So this is the same membrane used in some of their rain-shell jackets. The lining is a Pertex Microlight 30D 100% nylon 1.3 oz/yd.
I already mentioned the baffles, so this is Stretch Tricot Marmot’s Cross Baffle construction design that prevents down from shifting, this helps in avoiding cold spots, and it also wraps around the foot box.
Marmot’s 4-season sleeping bag for backcountry warmth
800-fill power goose down packs down small and provides insulation
Mummy shape keeps warm air close to the body
Down-filled draft tube keeps cold air out
Includes stuff and storage sack
Item #MAR00IB