Satin-woven design kotatsu futon, quilt and mattress set, 4-foot rectangular, 80 x 120, suitable for tabletops ▼ The outer fabric of the duvet is a satin weave that is also used in apparel. Satin weave with a smooth feel. You can enjoy the glossy look depending on how the sunlight hits it. We used fabric that gives a luxurious feel. The lining is made of microfiber with excellent heat retention properties. The parts that come into direct contact with the skin are Smooth microfiber with excellent heat retention. Once you're in, you might not be able to get out.