Balega Ultralight No Show Athletic Running Socks for Men and Women (1 Pair) Drynamix Polyester 79%/Nylon 19%/Elastane 2%. Imported Hand crafted, high performance ultralight no show running socks are lighter and thinner to provide a true minimalist running feel Ultrafine Hi-Tech performance yarns on a high needle counting knitting machine provides the sheerest, lightest sock on the planet while still providing the necessary protection Reinforced cushioned heel and toe for comfort and durability and a Broad elastic arch support in both the arch and ankle firmly keep the sock in place Heel tab aids in preventing the sock slipping into your running shoe Left/right construction method ensures the perfect fit