Add extra warmth and luxurious comfort to your sleeping bag with the Expander Travel Liner from Sea to Summit. This expanding rectangular sleeping bag liner is made from a premium stretch knit poly-cotton fabric that allows it to stretch to twice its width and even makes it warmer than a standard cotton weave liner. The anti-microbial treatment prolongs the life of your liner and sleeping bag by keeping the liner fresh, hygienic, and odor-free. It also won't wash out of the liner and doesn't use nano-sized particles. Double-folded and reinforced seams ensure this liner is tough enough to handle a night at the campsite or anywhere else. Plus, it's machine washable, making it easy to care for. Size variation: standard rectangular. Dimensions: 73" x 36". Weight: 11 oz. Color: navy.