Socks Supplement: Cozy Room Socks, Just Like a Kotatsu Color: Black Size: 23-25cm Material: Acrylic Thanks to a unique knitting method, this product warms the San'in-ko acupressure point, which is a key point for preventing coldness in the ankles, and keeps your toes warm. *These will be shipped in a Yu-Packet Post Mini envelope after being removed from their original packaging. *When washing, please use a laundry net and wash with a neutral detergent. Although these are new and unused, there may be some loose threads due to being a foreign product. Please understand this before purchasing. ★Other colors are also available! Autumn/Winter, Women's, Cold Protection Black, Gray, Pink Kotatsu-style, Similar to Kotatsu Socks Warm Socks