Sock size toddler and shoe size 3-7, age 1-2 yrs * Sock size xs, size 6-11, age 2-4 yrs * 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