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Helmet Sizing Guide

Helmet Sizing Guide


 Hat Size
Circumference
(inches)
Circumference
(milimeters)
Approximate
Designation
 XXXXS18.11
460
 
XXS
18-1/2
470
Toddler
6
19
483
 
6-1/8
19-3/8
492
 
6-1/4
19-3/4
502
 
6-3/8
20-1/8
511
 
6-1/2
20-1/2
521
 
6-5/8
20-7/8
530
Small
6-3/4
21-1/4
540
Medium
6-7/8
21-5/8
550
 
7
22
559
 
7-1/8
22-3/8
568
 
7-1/4
22-3/4
578
Large
7-3/8
23-1/8
587
 
7-1/2
23-1/2
597
 
7-5/8
23-7/8
606
 
7-3/4
24-1/4
616
 
7-7/8
 24-5/8625
 
8
25
635
 
8-1/8
25-3/8
644
 
8-1/4
25-3/4
654
 
8-3/8
26-1/8
663
 
8-1/2
26-1/2
673
 
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