Dropping temps? No worries. The Marmot Wind River -10F sleeping bag is stuffed with 650-fill-power down to keep you nice and toasty. Features like a down-filled draft collar plus a multi-baffled hood team up to prevent heat loss, and dual-side zips let you regulate the temp while making it easy to climb in and out of the bag. Looking for more room? Open the footbox for space to stretch or zip it up for extra warmth. Unzip the extended zipper flaps on extra-cold nights for blanket-like coverage.