The ProLite Plus mattress combines increased all-season warmth with the convenience of self-inflation. Therm-a-Rest's ultralight U.S. sourced foam reduces weight and boosts compressibility to keep your winter backpack even lighter. In addition, a special pattern of their patent-pending diagonal-cut foam channels deliver added warmth for women and cold sleepers, making it the ideal choice for ski touring, cold weather expeditions and winter camping. Stuff sack included.