A liner is the core of a sleep system, keeping your sleeping bag clean and improving your sleep climate. The Comfort Blend liner uses a stretch-knit fabric made of polyester and TENCEL Lyocell fibers to create a soft, comfortable, moisture-wicking layer around you. Features The TENCEL Lyocell/Polyester blend provides excellent moisture wicking and next-to-skin comfort HeiQ odour control technology helps keep the liner fresh even after extended use Stretch-knit fabric and a rectangular cut for superior freedom of movement Available in a Rectangular shape, and a Rectangular version with standard-size pillow sleeve Rectangular version is designed for use with rectangular sleeping bags and quilts: improve your sleep climate while keeping your bag or quilt clean Rectangular with Pillow Sleeve is a great hygienic sleep sheet wherever you travel Sea to Summit Guarantee is offered for the Lifetime of this product