Use the Sea to Summit Breeze Mummy Sleeping Bag Liner inside your sleeping bag to provide the stretchability and moisture management needed to enjoy a comfortable night's rest. Built with a blend of 70% Coolmax Ecomade (100% recycled) polyester and 30% biobased TENCEL Lyocell fibers, the Breeze liner offers a luxurious next-to-skin feel, with short side openings and a drawcord footbox for enhanced breathability and comfort. HeiQ Fresh odor control technology helps keep your liner fresh even with extended use. Works seamlessly with sleeping bags of any shape. Mfrs. lifetime guarantee. 70% Coolmax Ecomade (100% recycled) polyester 30% biobased TENCEL Lyocell Use inside your sleeping bag for extra comfort Moisture-wicking stretch-knit fabric Short side openings; drawcord footbox HeiQ Fresh odor control technology Mummy shape easily fits all bags