TO DETERMINE HAT SIZE, measure around your head just above the ears and eyebrows.
Take this dimension in inches and divide by 3.14. This will give your hat size.
EXAMPLE:
For a head measuring 23.5 inches -
dividing 23.5 by 3.14 yields 7.48 -
7.48 equates to a 7-1/2 hat size.
See chart below to convert from hat size
to helmet size.
| NOMINALSIZE | HAT SIZE |
| SMALL | 6-5/8 to 6-7/8 |
| MEDIUM | 6-7/8 to 7-1/8 |
| LARGE | 7-1/8 to 7-3/8 |
| X-LARGE | 7-3/8 to 7-5/8 |
| XX-LARGE | 7-5/8 & UP |