polyester Imported The Comfort Blend Sleeping Bag Liner provides comfort and improved hygiene while travelling or camping Lightweight TENCEL Lyocell/Polyester blend with HeiQ odor control technology keeps the liner fresh even after extended use Stretch-knit fabric and a rectangular cut provide superior freedom of movement Rectangular version is designed for use with rectangular sleeping bags or to provide an extra layer of protection from hotel sheets while travelling Improve your comfort while keeping your bag or quilt clean, Sea to Summit Guarantee is offered for the Lifetime of this product The Comfort Blend Sleeping Bag Liner keeps you clean and comfortable while camping and travelling. The stretch-knit fabric, made of polyester and TENCEL Lyocell fibers, surround you with a soft and comfortable moisture-wicking layer.