Jefferies Socks Little Boys' Wool Boot Socks  (Pack of 3) 45% Acrylic/40% Merino Wool/13% Nylon/2% Spandex Made in US Machine Wash This is a 3 pair pack of socks Sock size s - shoe size 9-1 - age 3-7 yrs Sock size m - shoe size 12-6 - age 5-10 yrs Sock size l - shoe size 6-9 - age 10-adult