S S M M L L XL XL XXL XXL XXXL
U. S. 6 3/4 6 7/8 7 7 1/8 7 1/4 7 3/8 7 1/2 7 5/8 7 3/4 7 7/8 8
Centimeters 54 55 56 57 58 59 60 61 62 63 64
Head Size (inches) 21 ΒΌ 21 5/8 22 22 1/2 22 3/4 23 1/4 23 5/8 24 24 1/2 24 3/4 25 1/4