Show your support for Track/Cross Country with this pair of performance crew socks. The socks are made of 60% polyester / 25% polypropylene / 10% spandex / 5% rubber. Great arch support built in along with air vents for comfort and breathability. Our socks are made of moisture wicking fabric for all day comfort. Sock sizing: SMALL SOCK size 6-8 (4-6 women's shoe size and 12-4 youth shoe size), MEDIUM SOCK size 9-11 (women's shoe size 6-9 and youth shoe size 4-8), LARGE SOCK size 10-13 (shoe sizes 8-12), XLARGE SOCK size 13-15 (shoe sizes 12-15). Care instructions: machine wash warm, do not use bleach, tumble dry medium, do not iron and do not dry clean.