Power bands of Lycra hug your entire foot for maximum support. This snug, supportive fit eliminates movement to prevent blisters.High density cushioning provides extra protection in high impact areas.iWick fibers wick moisture to keep feet cool and dry.Mesh construction on top of the sock provides ventilation for added breathe-ability.Y-heel construction keeps the sock from sliding into the shoe.The Perfect Toe® (No irritating toe seam.)74% iWick Polyester, 23% Nylon, 3% Lycra Spandex Sizing: