For those with cold feet who can't sleep. These are sleep-specific socks designed to warm the ankles and the soles of the feet, where blood vessels are concentrated, leading to a comfortable sleep. Manufacturer: Okamoto Corporation Country of Origin: Japan Material: Acrylic, Wool, Others Color: Gray Size: 22-25cm ※ Do not tumble dry. ◆ We have carefully set the price. Please refrain from price negotiations. ◆ As this is an unopened new item, please understand and purchase accordingly.