The soft polycotton sheet from Basic Nature will warm you a little more inside your sleeping bag. Ideal for turning your summer sleeping bag into a spring/autumn one without buying a new sleeping bag. It can also be used as a sleeping bag on its own for a summer nap. Additionally, it protects and keeps the sleeping bag clean, reducing the need for washing and extending its lifespan. It has an opening on one side and is suitable for rectangular sleeping bags. The fabric consists of 35% cotton and 65% polyester (polycotton). It comes with a carrying bag and is available in 2 colors: blue and anthracite.