These kotatsu socks, designed for foot sizes 23-25cm, utilize warm technology. They are new and unused. - Product Name: Marude Kotatsu Socks (Socks Supplement) - Size: Foot size 23-25cm - Features: Uses warm technology - Color: Black - Materials: Acrylic, Wool, Nylon Okamoto Corporation Thank you for viewing. Please understand that I will remove them from the packaging and flatten them for shipping.