Marmot Mad River 15 Sleeping Bag

Your go-to mummy bag for backcountry basecamp, the Marmot Mad River 15 sleeping bag features 650-fill-power down—giving you light, lofty warmth that won't let you down or weigh you down.

Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.

Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.

• Certified 650+ fill-power down with ExpeDRY treatment for quick-drying, loft-retaining performance
• 100% recycled shell and lining fabrics
• Full-length left-side zipper with snag-free slider provides ventilation, comfort control ,and easy access in and out of the bag
• Short right-side zipper provides fold-down comfort and extra ventilation control
• Draft collar seals in warmth and prevents heat loss when moving during sleep
• Anatomically designed footbox with wraparound construction increases warmth and comfort
• Internal stash pocket
• Gender-free design
• ISO-tested for reliable temperature rating
• Compression sack and storage bag included