Aetrex Socks, with Copper Sole™ Technology, are unsurpassed in comfort, performance, and protection. Copper Sole Technology has been lab tested and clinically proven to help prevent Bacteria, Fungi, and Odor, as well as improve skin texture and appearance. Copper ions are embedded in the CUPRON™ yarn to eliminate 99.9% of the Bacteria and Fungi in the sock, providing superior protection against odor that’s guaranteed for the life of the sock.