1000 Mile Sportswear Men's Fusion Sport Socks Outer Layer: 57% Nylon 41% Tactel 2% Spandex; Inner Layer: 100% Tactel Imported Full padded Achilles tendon protection - the first sock to offer you this Arch bracing gives additional support Extra padding for toe, ball and heel zones Double layer construction eliminates friction between the foot and shoe, reducing wear and preventing blisters Tactel inner layer wicks away perspiration to keep feet dry and cool