Blue socks made with COOLMAX material for a comfortable fit. The size isn't specified, but I'm 24.5cm and I can wear them, as I have another pair. I think they would fit sizes 23-25cm. This is a rare model that you don't often see in Japan. - Brand: MERRELL - Model Name: RAINBOW MTN OVER THE CALF SOCK - Color: BLUE - Material: 94% Polyester, 3% Nylon, 3% Lycra Thank you for looking. Gender: Unisex