Thorlos Unisex S1TOU Ski Ultra Thin Over the Calf Sock, Black with Lime, Small 67% Thor-Wick WARM polyester, 25% Nylon, 8% Spandex Turn Inside Out-Machine Wash-Use Liquid Fabric Softner 55% Thermolite, 29% Nylon, 10% Polyester, 6% Spandex Thermolite for maximum warmth and wicking Reinforced flat knit for protection and comfort Pique stitching in calf and arch for stretch and fit Extra spandex in ankle for precise fit.