The Adaptor COOLMAX sleeping bag liner is an excellent versatile choice that adapts to varied temperatures and humidity. It's ideal for use on its own in warm climates, or as a liner in your regular sleeping bag. The COOLMAX fabric is super soft and luxuriously comfortable, kind of like your favorite tee shirt and with its moisture-wicking properties, it will help to provide a dreamy sleep wherever you are. A sleeping bag liner is imperative for keeping your sleeping bag clean and is easily washable. The COOLMAX Adaptor liner is also available in an Insect Shield version to protect against insect in buggy environments. Sea to Summit - Adaptor Coolmax Sleeping Bag Liner