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Fiberglass shell Meets or exceeds DOT standards
Adjustable top vents, flow through rear vents
MEASURING YOUR HEAD: Use a cloth tape to measure the circumference of your head one inch above the eyebrows, or at whatever point gives the maximum dimension. Some directions state: "If you find that your measurement falls between two sizes, choose the smaller size," while others say "Choose the larger size." It's not clear which is best. But it needs to fit snuggly .
XS - 20 1/4 - 20 7/8"
S - 21 - 21 5/8"
M - 21 3/4 - 22 3/8"
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Small |
Medium |
Large |
X-Large |
| Head Size (in) |
21 1/2 |
21 7/8 |
22 1/4 |
22 5/8 |
23 |
23 1/2 |
23 7/8 |
24 1/4 |
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| Hat Size |
6 7/8 |
7 |
7 1/8 |
7 1/4 |
7 3/8 |
7 1/2 |
7 5/8 |
7 3/4 |
L - 22 1/2 - 23 1/8"
XL - 23 1/4 - 24"
XXL - 24 1/8 - 24 7/8" .
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