Bombas Calf Socks Size Large Shoe size Womens 12+ Shoe size Mens 9.5 - 12 Black color Performance footbed Honeycomb arch support system Y-stitched heel Stay Up technology 83% poliéster 5% nylon 5% rubber 5% cotton 2% spandex They are knit with Love, made from high quality yarns and engineered for comfort, durability and warmth.