Kids' Smartwool Sock Size Chart

 
Size U.S. Euro U.K.
X Small 6 - 8.5 22 - 25 5 - 7.5
Small 9 - 11.5 26 - 28 8 - 10.5
Medium 12 - 2.5 29 - 32 11 - 13.5
Large 3 - 6 33 - 36 1 - 4.5