Copper Sole Men's 2 Pack Blue Collar Work Crew Socks 90% Polyester, 9% Nylon, 1% Lycra Spandex Imported Machine Wash Rejuvenates the appearance of your skin by 30 percent over 30 days Kills the athlete's foot fungus right on the sock. Only socks with cupron enhanced fibers have EPA-registered fibers that kill 99.9 percent of the athlete's foot fungus after 12 hours of contact with the sock Eliminates odor right on the sock Just wear your Copper Sole socks for about 12 hours a day for 3-4 weeks Wear them during the day or wear them to bed. Your choice