"Silk and cotton No-show toe socks" now available in new colors: iron gray, peach squash, and black (restocked). The inside has elastic threads on the outside so that the silk touches the foot as much as possible, and cotton threads are placed on the outside to add strength while maintaining a thinness, so the fabric is thin but firm. We are particular about using natural materials, and the heel part has been designed to prevent slipping without using anti-slip rubber. Please see the product page for details.