The Sea to Summit 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.  Wicks moisture for a more comfortable night's sleep Adapts to varied temperatures and humidity Comfortable stretchy fabric Keeps sleeping bag clean Machine wash and air dry. Avoid fabric softeners & dryer sheets to maintain wicking performance. Packs into its own Ultra-Sil™ stuff sack Sizing Mummy Shape: 210 cm x 90 cm ; 248 grams Sea to Summit Coolmax Adaptor Sleeping Bag Liner (Mummy)