With a blend of 70% COOLMAXA(R) EcoMade and 30% bio-based TENCEL(TM) lyocell fibers, the Sea to Summit Breeze sleeping bag liner with Insect ShieldA(R) offers moisture management and it repels insects. Features COOLMAX fabric technology keeps you dry and comfortable by wicking moisture from the skin TENCEL lyocell is a USDA-certified fiber, manufactured using an environmentally responsible process and the blended fabric offers luxurious next-to-skin comfort Insect Shield is a permethrin-based treatment that repels a number of insects Unlike spray-on/wash-in permethrin, Insect Shield does not dissipate in contact with air, water or ultraviolet rays and will last through 40 wash cycles HeiQ Fresh odor control technology helps keep the liner fresh even after extended use Sea to Summit Guarantee is offered for the lifetime of this product