The "STOPPER" is an acrylic soccer tube sock from Twin City Knitting. It"s considered the standard of the industry. Buy them for yourself or for your team. Tube Sock Design - Half-Cushion Foot for impact absorbency - Double-Welt Top for a comfortable fit. It"s made with an 85% Acrylic, 8% Polyester, 4% Nylon, 2% Rubber, 1% Spandex blend. Recommended for ages 13 & up. OSK