Extremely lightweight, tapered sleeping bag liner that keeps your sleeping bag clean and adds insulation and comfort. The fine and lightweight fabric made from this cotton is durable, breathable and soft to your skin.Fine yarn and a special weaving technique make the high quality cotton used for COCOON TravelSheets a very lightweight and durable fabric. It is breathable, very comfortable against your skin and creates a natural vapor balance. Cocoon - Sleeping bag liner leaves