???Premium Fabric?66.3% Polyester, 32.5% Nylon, 1.2% Spandex. The blend of LIN performance cycling socks is designed to be comfortable ,durable and nondeformable. ???Breathable Upper Mesh? Mesh vent structure on the instep of our bike socks make your skin breathable and comfortable ,promoting feet temperature regulation. ???Flat Hidden Seam Toe??LIN bicycle socks are crafted with virtually invisible toe seam ,eliminating friction on the toes and providing superior comfort. ???Big Y Heel Design??Y shape design creates a contoured heel that make sure the biking socks always stay in place help you enjoy road cycling and mountain cycling. ???Coolmax Footbed??Coolmax fabric enhances the experience to control moisture wicking and keep your feet cool and dry ,perfect as mountain bike socks or road bike socks.