Four new colors, slate navy, citrus green, red, and silver white, have been added to the "Sozai to iro “Basic”" series, which is knitted with 100% silk on the inside and 100% cotton on the outside. The socks are just the right thickness, and the inside is pile knitted with luxurious silk thread. Although they are two-layer socks, they are made of a single piece of fabric, so they do not slip off each other, and they absorb and release sweat and waste from the soles of your feet, making them suitable for wearing all year round. From the heavy winter outfits to the light spring outfits. We hope you will enjoy wearing these socks. For more information, please see the product page .