Sizing- 
Child:
Medium (Sizes 11 to 12)
Large (Sizes 12.5-1)
XL (Sizes 1.5 to 3)
 
Adult:
Petite (Sizes 4, 4.5, 5)
Small (Sizes 5.5 to 7)
Medium (Sizes 7.5 to 9)
Large (Sizes 9.5 to 11)
XL (Sizes 11.5 to 13)
XXL (Sizes 13 to 15)