Eurosocks Silver DryStat Ultra Light Ski & Snowboard Performance Socks nylon 70% Silver Drystat, 10% Microsupreme, 15% Nylon, 5% Spandex Elasticized Arch and Ankle support, ultra smooth with no bunching, flat toe seam Ventilation channel for superior moisture management for maximum comfort and warmth provided by "Silver Drystat" machine washable/dryable Italy