Marmot Mad River 15 Sleeping Bag Sleep Well Out There When the trail is long and the night is cold, what you really want is a bag that's ready to work the moment you get in it. The Mad River 15 is a classic down mummy bag rated to 15degF, made for three-season backpackers who want reliable warmth without hauling extra weight. The down is treated with Expe Dry, a permanent chemical-free process that helps it dry fast and hold its loft when condensation and humidity creep in overnight. A full-length left-side zipper with a secondary short zip on the right gives you real ventilation options, and the anatomically designed footbox keeps your feet comfortable without creating cold spots. Toss your headlamp or lip balm in the internal stash pocket, and you're set for the night. Features650-fill-power RDS-certified duck down with Expe Dry treatment permanent chemical-free moisture resistance that maintains loft and warmth in damp conditions100% recycled nylon ripstop shell and taffeta lining durable, lightweight construction with recycled-content materials throughout Full-length anti-snag left-side zipper with secondary right-side zip full ventilation control and easy in/out access Draft collar, anatomical footbox, and insulated draft tube seal in warmth at key heat-loss points for consistent temperature retention | Marmot | Mad River 15 Sleeping Bag | Nylon