These are "Kutsushita no Shita," free-size socks made of natural silk. Using carefully selected genuine silk as the material, these are purely Japanese-made products, with all processes from knitting to finishing done in Japan. You can wear them layered under your existing socks, or wear them alone during the warmer months. - Brand: Silk - Product Name: Kutsushita no Shita - Material: Natural Silk - Color: Ivory - Size: Free Size Thank you for viewing.