Place measuring tape around widest part of head where helmet is worn-usually. This will be just above the ears and about a half inch above the eyebrows.
Measure it couple times to get the most accurate measure.
A helmet should fit snug on your head. If it moves while wearing, it is too large.
Size
X-Small
Small
Medium
Large
X-Large
XX-Large
XXX-Large
IN
20. 7/8 - 21 1/4
21 5/8 - 22
22 1/8 - 23 1/8
23 1/4 - 23 5/8
24 - 24 3/8
24 3/4
25 1/4
CM
53 - 54
55 - 56
57 - 58
59 - 60
61 - 62
63
64
Size
IN
CM
X-Small
20. 7/8 - 21 1/4
53 - 54
Small
21 5/8 - 22
55 -56
Medium
22 1/8 - 23 1/8
57 - 58
Large
23 1/4 - 23 5/8
59 - 60
X-Large
24 - 24 3/8
61 - 62
XX-Large
24 3/4
63
XXX-Large
25 1/4
64
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