The AceCamp 3963 Sleeping Bag Liner allows you to bring the comfort of your bed into the outdoors. This lightweight and breathable liner adds additional warmth and is soft to the touch. It also helps to keep the inside of your bag clean, saving it from wear and tear. This AceCamp 3963 Sleeping Bag Liner is made of cotton and is a mummy-style liner. Since its founding in 2000, AceCamp has provided a range of outdoor equipment and emergency preparedness products to customers in dozens of countries around the world. With products from cookware and waterproof fire starters to multitools and emergency shelters, AceCamp gives outdoor enthusiasts gear they can trust in order to enjoy the adventure.