Universal Textiles Men's Thermal Ski Socks 1 Pair Shoe US 7-12 Black Acrylic, Nylon, Elastane High quality extra warm thermal ski socks. Ideal for Skiing, Trekking and other sports. Socks have longer leg and stretch comfort fit top, padded shin bone protection, stretch panel for better leg fit and grip zones for extra foot and ankle support. Fiber: 75% Acrylic, 23% Nylon and 2% Elastane.