Ultradry Copper Boot Socks 3 Pairs, Moisture and Odor Control, Antibacterial 72% Cotton, 14% Polyester with CUPRON COPPER Fibers, 13% Nylon, 1% Spandex Machine wash COPPER SOCKS KEEP FEET DRY AND HEALTHY, eliminating the bacteria and fungi that cause odors while improving the overall appearance of the skin and keeping you feet warm and dry NEW TECHNOLOGY - Copper threads are incorporated into the sock's fiber MADE IN USA, Machine Wash, One size fits Women 6.5-14, Men 5.5-13 MOISTURE CONTROL, Odor Control FLAT SEAM CONSTRUCTION for extra comfort and protection