Romance Kosugi's fluffy blanket, single size. The size is 140 x 200 cm. When you put this heat-generating blanket between your down comforter and your body, it generates heat and makes your futon very warm. It uses moisture-absorbing and heat-generating cotton, and since it's 100% cotton, it's gentle on the skin. This is the description from Romance Kosugi: "This is a fluffy blanket from the "warm support" series, which warmly supports sleep for everyone in the cold season. The crinkled, stretchy fabric has a high fit and doesn't let warmth escape. It also doesn't shed easily and is durable."