Feetures! High Performance Ultra Light No Show Tab Sock - Heather Gray Medium Polyester High-density cushioning provides extra protection in key impact areas. iWick fibers wick moisture to keep feet cool, dry and odor-free. The PerfectToe (No irritating toe seam.) Y-heel construction keeps sock from sliding into the shoe. 74% iWick Polyester, 23% Nylon, 3% Lycra Spandex