Pure Athlete High Performance Wool Ski Socks &ndash; Outdoor Wool Skiing Socks, Snowboard Socks Enhanced Warmth - innovative blend of merino wool and polypropylene wicks moisture away while maintaining the foots natural temperature to prevent feet from feeling too warm Key Comfort Areas - advanced knitting techniques provide cushioning in the shin, ankle, and the foot areas to ensure the ultimate comfort and prevent any discomfort when worn with ski boots Ski Socks Stay Up: The wool ski socks feature an elastic at the top to prevent the ski socks from sliding down, ensuring the stay in place all day while you are on the slopes Arch Support: An elastic arch support provides comfort and helps to reduce fatigue in the feet Machine Washable: the high performance ski socks are made to last over many ski seasons. Made of 54% Nylon, 25% Merino Wool, 16% Polypropelene, 5% Spandex