We have teamed up with Drymax to create a high quality wicking sock so you can wear head to toe UD. Features Drymax olefin inner layer with moisture-attracting outer layer for superior wicking Flat toe seam Vented arch band Breathable mesh upper Specifications Materials: 44% polyester, 39%drymax olefin, 11% spandex Sizing (USA) S: Women's 5 - 7 / Men's 3.5 - 5.5 M: Women's 7.5 - 9.5 / Men's 6 - 8 L: Women's 10 -12 / Men's 8.5 - 10.5 XL: Women's 12.5 - 14.5 / Men's 11 -13 | Ultimate Direction Drymax Socks Size Medium