Fila Swift-Dry Men's Active Wear Black Socks -Pack of 6 Socks 87% Polyester/ 10% Cotton/ 3% Spandex Machine Washable Swift Dry are designed and knit to keep dry. The Comfort Styling allows for constant Air Flow Supportive Contoured Heel Breathable Knit Material 87% Polyester/ 10% Cotton /3% Spandex