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.