Loose-fitting neck warmer. Fluffy knitted knitting is adopted, which has the property of making it difficult for body heat to escape. The part that comes into contact with the skin is made of 100% silk (white part), and the inside is coated with ceramic charcoal from Shizuoka. Washing can be done by hand or in a small laundry net and washed in the washing machine. * Ceramic charcoal is made by coating thinned wood in Japan with clay (minerals) and then carbonizing it at high temperatures. It has functions such as deodorization, humidity control, and far-infrared rays, and is manufactured with the aim of increasing the value and potential of Japan wood.