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Helmet Sizing Charts
 Inches  Size Metric Equals
 21-1/4 6-3/4 54 XX-Small
 21-5/8 6-7/8 55 XX-Small
 22 7 56 X-Small
 22-3/8 7-1/8 57 Small
 22-3/4 7-1/4 58 Medium
23-1/8 7-3/8 59 Medium
23-1/2 7-1/2 60 Large
 23-7/8 7-5/8 61 Large
 24-1/4 7-3/4 62 X-Large
M3 XTRA SIZING
 Inches  Size Metric
 25-1/8 8 64
 25-1/2 8 65
 25-7/8 8-1/4 66
 26-1/4 8-1/4 67
 26-3/8 8-1/2 68
MEASUREMENT: Measuring the head is a starting point for the entire sizing procedure. Due to varying shapes, heads that are apparently the same size when measured by a tape may not necessarily fit the same size helmet. The circumference of the head should be measured at a point approximately one inch above the eyebrows in front and at a point in the back of the head that results in the largest possible measurement. Take several measurements to make sure you have the largest one.

 

 
 
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