NCAA Miami Hurricanes Custom Athletic Crew Socks polyester, cotton, nylon Officially licensed NCAA graphic athletic crew socks by Rock 'em SUPERIOR GRAPHICS: smooth upper sock provides a canvas for unmatched graphic design clarity and color vibrancy CUSTOM FIT: Upper and lower arch compression for superior support AMAZING COMFORT: double cushioned soles and impact zones Small/Medium fits men's shoe size 6-8.5 and women's 7.5-9.5. Large/X-Large fits a men's 9-13 and women's 10-13. Youth size fits shoes size 2-5.5.