Seventy percent of people sleep on their side, but mummy bags are not designed to accommodate this. With a unique Spoon shape adding room at the elbows and knees, the Disco is a three-season down mens backpacking bag that is designed for side sleepers, and allows you to shift positions throughout the night. This popular bag is loaded with features, including Thermo Gills that help regulate temperature during the night, Blanket Fold that provides tucked-in comfort, and a waterproof/breathable footbox to withstand tent condensation. Zip together with the women's Rave for a double bag. This bag is a versatile superstar for everything from backpacking to car camping.