The Marmot Wind River Sleeping Bag is a down sleeping bag for cold weather backpacking. The 650 fill power down brings the heat, while Down Defender deters moisture. When your adventure includes cold, wet weather, this bag is the go-to. The shell and liner both feature recycled fabrics, and they're plenty sleek for easy entry as well as simple stuffing into the included stuff sack. Toasty warm down to -10°F and when your feet get to hot, open up the footbox zipper to cool your toes. Features of the Marmot Wind River Sleeping Bag Fold-down second zipper provides added ventilation and easy access, main zipper anti- snag slider reduces snagging Anatomical wrap-around footbox increases Insulation and room for your feet, more warmth and comfort Certified 650 fill power down with down defender to improve water-resistance in wet conditions EN tested Nautilus multi-baffle hood Down-filled collar with easy access draw cord Full length locking YKK two way zipper with draft tube to reduce heat loss Internal stash pocket and heater pocket in footbox Ground-level side seams Hood draw cord Zipper garage Stretch tricot baffles Two hang loops Stuff and storage sack included Fabric Details Shell: 20D 100% Nylon mini ripstop Lining: 20D 100% Nylon plain weave