Sugoi Resistor Aero Shoe Cover Main Body : 100% Polyurethane Laminate, 90% Polyester, 10% Spandex Back / Back Panel : 80% Nylon 20% Spandex Imported PU coated stretch Lycra offers lightweight wind and waterproof protection Stretch bound edge fits snugly around shoe and provides flexibility to accommodate large cleats Lightweight and packable