CM

Inches

Adult Small
53 - 56
20 7/8 - 22 
Adult Medium
56 - 59
22 - 23 1/4 
Adult Large
59 - 62
23 1/4 - 24 1/2
Toddler
48 - 52
18 7/8 - 20 1/2
Child
52 - 57
20 - 22 1/2