The circumference of the head should be measured at a point approximately one inch above the eyebrows or at whatever point gives the largest possible measurement.
Racing helmets
helmet
size
measurement
metric
XS
6-5/8 to 6-3/4
20-7/8 to 21-1/4
53 to 54
S
6-7/8 to 7
21-5/8 to 22
55 to 56
M
7-1/8 to 7-1/4
22-3/8 to 22-3/4
57 to 58
L
7-3/8 to 7-1/2
23-1/8 to 23-1/2
59 to 60
XL
7-5/8 to 7-3/4
23-7/8 to 24-1/4
61 to 62
2XL
7-7/8 to 8
24-3/4 to 25-1/8
63 to 64
CMR helmets
helmet
size
measurement
metric
S
6-3/4 to 6-7/8
21-1/4 to 21-5/8
54 to 55
M
6-7/8 to 7
21-5/8 to 22
55 to 56
L
7-1/8 to 7-1/4
22-3/8 to 23-3/4
57 to 58
Rookie helmets
helmet
size
measurement
metric
One size
6-3/4 to 7
21-1/4 to 22
54 to 56
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