FALKE Women's Ru5 Invisible Run Sock, 55% Polyamide, 43% Polypropylene, 2% Elastane Imported No Closure closure Machine Wash Invisible run sock with light cushioning for direct power transmission Mesh zones in the instep area for maximum cooling and moisture transport Silicone threads on the inner side prevent the socks from slipping Additional strap to cushion the heel Lay flat to dry