Durable socks with knit-in stirrup made to go to the knee. X-Small - Youth 8-2...Durable socks with knit-in stirrup made to go to the knee. X-Small - Youth 8-2 Small - Youth 2-4.5 Medium - Men 5-9 Women 6-10 Large - Men 9-12 Women 10-13 X-Large - Men 12+ Women 13+more