Kotatsu cover and futon set, 2-piece set, neat type, 4 shaku, rectangular, 80 x 120, compatible with tabletop, choice of microfiber flannel, dust mite resistant, stylish I can't leave the kotatsu A luxurious, melting texture. The flannel material adds softness and warmth to the skin. Make your relaxation time even more luxurious. Soft and smooth flannel that will charm the kotatsu people Both the comforter and mattress are made of specially processed flannel material to make them soft and fluffy and smooth to the touch. You can now enjoy a more comfortable kotatsu time. Its soft and smooth texture makes you want to rub it against your skin. It's also lightweight and comfortable to wear. It's so light and soft that you might find yourself dozing off before you know it.