Socks Supplement: Just Like a Kotatsu, Warm Room Socks Color: Black Size: 23-25cm Material: Acrylic Thanks to a unique knitting method, it warms the San Yin Jiao acupoint, which is a pressure point on the ankle that protects against cold, and keeps your toes warm. * Will be shipped from the special bag via Yu-Packet Post Mini. * When washing, use a laundry net and wash with a neutral detergent. Although it is new and unused, it is a foreign product, so there may be some loose threads. Please understand this before purchasing. ★ Other colors are also on sale! Autumn/Winter, Women's, Cold Protection Black, Gray, Greige, Beige, Lavender, Off-White Kotatsu-style, Just Like Kotatsu Socks Warm Socks