Loose room socks. From the heel to the toe, it is knitted with a pile that contains plenty of air, and the ankle part is knitted with a patented knitting method that has the property of not letting body heat escape. The white part of the inner part of the ankle is made of 100% silk, and the inner ankle part is coated with ceramic charcoal from Shizuoka. * Ceramic charcoal is carbonized after coating clay (minerals) on thinned wood in Japan. It has functions such as deodorization, humidity control, and far-infrared rays, and is also manufactured for the purpose of increasing the value of Japan's trees and mountains* You can wash your clothes by hand or put them in a small laundry net and wash them in the washing machine.