These Nike socks features half cushioned, medium-density padding to provide impact absorption. Dri-FITģ fabric wicks away moisture to help keep feet dry and cool. Arch support offers a snug and secure fit. Anatomical left and right adds superior fit and cushioning. 53% polyester/23% nylon/22% cotton/2% spandex. Imported. Sizing: M fits menís shoe size 6-8, womenís shoe size 6-10. L fits menís shoe size 8-12, womenís shoe size 10-13. XL fits menís shoe size 12-15.