Kotatsu quilt and mattress set, 2 pieces, 6 shaku, rectangular, 90 x 180, suitable for tabletop, dust mite resistant, flannel, "double warmth", stylish Flannel material for a smooth feel Added heat retention. Make your relaxation time even more luxurious. I can't leave the kotatsu A luxurious, melting texture. We compared it with general fleece material. Compared to ordinary fleece material, the difference is obvious. We use flannel material that has been specially processed to make it softer and smoother to the touch. Compared to fleece material, the density is about 140% higher! (Compared to our other products) The tightly packed yarns trap plenty of air between them, making it even warmer. The long, brushed pile gives it a luxurious, melting feel. The underside of the duvet that comes into direct contact with your skin is also made of fluffy flannel, making it even warmer. The surface of the mattress is made of the same material as the duvet. In addition to its excellent heat retention, it has an exquisite texture that makes you want to touch it forever, inviting you to doze off.