◆The difference is obvious when compared to general fleece material. 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! (Manufacturer comparison) There is plenty of air trapped between the tightly packed threads, making it even warmer. The fibers are brushed to be long, giving the fabric a luxurious, melting feel against the skin. -Soft and smooth flannel material ・General fleece material 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 from the same material as the duvet, so it's so soft you'll want to take off your socks and touch it with your bare feet.