The Fox River Men's Valdez 2-Pack Lightweight Ski Socks are made from Thermolite polyester. These ultra-lightweight socks won't add weight and with URfit® System and Wick Dry™ technology you'll be comfortable and dry. A smooth, flat-knit construction provides lightweight comfort while the reinforced toe and heel add durability, so they last longer. You'll love the Fox River Men's Valdez 2-Pack Lightweight Ski Socks.