Sleep comfortably, even when it?s 20° F outside in the Coleman® Brazos? Cold Weather Sleeping Bag. The specially-designed, patented zipper system plows through the fabric to avoid snags, even around the bottom corner. The Thermolock? System reduces heat loss though the zipper, and Fiberlock? Construction prevents insulation from shifting?extending the life of your sleeping bag. When you?re ready to pack up, the patented Roll Control? System keeps the bag in place for easier rolling and the stuff sack makes packing and storing a cinch. The sleeping bag is machine washable.