The Big Agnes Cotton Sleeping Bag Liner is a soft cotton sheet for stand alone use or layering inside your sleeping bag. Whether you prefer the touch of cotton against your body while you sleep, like to keep your bag a little cleaner, or need a little extra warmth this minimalist is here to help. Use it while couch surfing or on a hot summer night of hammocking within the trees. Features of the Big Agnes Cotton Sleeping Bag Liner Designed as a versatile layer of protection with a multitude of end Uses Keep your sleeping bag clean and protected while increasing the temperature rating of your bag Stands alone as a packable layer for travel and warm weather over nights under the stars 100% cotton without chemical treatments is gentle on your skin Generous 42in. side opening to be snapped closed for increased Insulation or open for maximum ventilation Minimalist cinch hood closure Hooks located at the head and foot allow for easy attachment to sleeping bag liner loops Includes nylon taffeta, polyester mesh stuff sack