Kotatsu quilt and mattress set, 2-piece set, square, 75 x 75, compatible with table top, modern design, stylish We compared it with general fleece material. The difference compared to general fleece material is It's obvious at a glance. The flannel has been specially processed to make it softer and smoother to the touch. The density is 140% higher than fleece material (manufacturer comparison) There is plenty of air trapped between the tightly packed threads, making it even warmer. By brushing the fibers long, it has a luxurious, melting feel against the skin. A futon that can be used all year round The flannel mattress is It has a smooth texture and can be used comfortably all year round. It can be washed in the washing machine, so it's clean every day! The cover and comforter can be washed in a home washing machine. Even if it gets dirty, it can be washed immediately, so you can enjoy a clean kotatsu life.