The Micro Fleece MummyLiner from Design Salt can protect your sleeping bag investment. MummyLiners add warmth and comfort to your sleeping bag, while protecting it from dirt and body oils. They will extend the life of your bag by eliminating the need for frequent washings, which is how most bags are damaged. Specially designed to fit any tapered mummy sleeping bag, they feature a drawstring hood, a boxed foot-end and are double stiched for durability. On a hot night, your MummyLiner might be all you need.