DexShell Coolvent Mid-Calf Waterproof Socks Outer: 96% Nylon, 3% Elastane, 1% Cuff Elastics Interlining: 100% Waterproof and Windproof Porelle(R) Membrane Inner: 76% Coolermax(R) FX Yarns, 24% Nylon Mid-calf length Seamless construction for the highest comfort