With Pro Trek Dual Skin Technical 4 you get two socks in one to give maximum protection against chafing & blisters. The liner socks, made from 100% TACTEL nylon, maintains close contact with the foot providing a supersoft, breathable layer against your skin. TACTEL nylon deliver a durable, lightweight & breathable liner that dries 8 times faster than cotton. Extremely comfortable to wear Outer layer moves with your shoe, thus preventing friction & subsequent blisters Incorporates all over cushioning & ankle & arch supports to provide optimum protection. Quick drying, Supersoft, Lightweight, Breathable & Durable Outer Sock: 80% Cotton, 19% Nylon, 1% Lycra elastane. Inner Sock: 100% TACTEL Nylon. Sizes 6-11