Woven in a family-run factory in the U.S., these itch-free, heavyweight socks are comfortable, durable and warm. They're made with Responsible Wool Standard (RWS) wool certified by Control Union (TE-00052557). We blend RWS wool with nylon and polyurethane for excellent stretch and recovery that lasts the lifetime of the socks. The purchase of RWS-certified products demonstrates demand for better animal welfare practices and responsible land management in the wool supply chain.