The original DeFeet sock, the Aireator has been consistently upgraded and remains the gold standard of cycling socks. Affordable and incredibly durable, Aireator&';s are the most popular cycling sock the world has ever known. DeFeet Aireator mesh for superior breathability and comfort, the first sock to incorporate this type of open-mesh construction. Eco-friendly: Made from recycled water bottles in North Carolina, USA. Great for running, hiking, and on the bike Machine wash cold, tumble dry low. No bleach, softeners, or harsh detergents. 60% Nylon, 39% Recycled Polyester, 1% Lycra