A MummyLiner is an extremely lightweight tapered sleeping bag liner. Uses: sleeping bag liner for mummy-shaped sleeping bags, keeps your sleeping bag clean and extends its lifespan, adds insulation and comfort, and as a sleeping bag in warm climates. Features include a drawstring hood, wide top opening, and boxed foot end. Completely double-stitched. Available in several high quality materials. CoolMax: 100% Polyester

• CoolMax is the fastest drying moisture management fabric. Its four-channel fibers move sweat away from your body. CoolMax is highly breathable and easy to care for. 
• Microfleece: Microfleece is lightweight and compact. Fine microfibers transport humidity quickly to the surface. The material dries extremely fast and is practical in wet conditions.