Burton Men's AK Endurance Socks 64% Nylon, 19% Dri-Release Polyester, 7% Acrylic, 7% Spandex, 3% Merino Wool Imported Air Channels on Instep for Maximum Breathability Ultra fast-drying and highly breathable with superior wicking action and next-to-skin comfort Compression engineering designed to help muscles recover faster Reinforced foot bed for superior protection and durability Maintains performance even after repeated washings