Shoei Sizing Information

How to size
Helmets
Size Inches CM Hat Size
XX-SMALL 20 1/2 52 6 1/2
X-SMALL 20 7/8 - 21 1/4 53-54 6 5/8 - 6 3/4
SMALL 21 5/8 - 22 55-56 6 7/8 - 7
MEDIUM 22 1/2 - 22 7/8 57-58 7 1/8 - 7 1/4
LARGE 23 1/4 - 23 5/8 59-60 7 3/8 - 7 1/2
X-LARGE 24 - 24 3/8 61-62 7 5/8 - 7 3/4
XX-LARGE 24 3/4 - 25 1/8  63-64 7 7/8 - 8
XXX-LARGE 25 1/2 - 26 65-66 8 1/8 - 8 1/4