If you're a camper or traveler, this sleeping bag liner is a total game-changer! The rectangle shape with stretch-knit fabric gives you plenty of room to move around without feeling restricted. What's really cool is the Coolmax Ecomade fibers that wick moisture away - no more waking up feeling all clammy and gross in humid conditions. It's blended with TENCEL Lyocell too, which is super soft against your skin and environmentally friendly. There's even a built-in pillow sleeve to keep your pillow in place, plus HeiQ Fresh technology that controls odors so it stays fresher longer. The drawcord footbox can open or close depending on how warm you want your feet. It works with any sleeping bag shape, but integrates perfectly with Sea to Summit's Free-Flow Zip system. Whether you're hosteling, camping, or just want extra hygiene in questionable accommodations, this liner makes sleeping away from home so much more comfortable!