Using a flexible tape measure (one made of plastic or cloth).
Measure around you head just above the ears not too tightly as a hat must never be too tight, measure a couple of times to be sure …
I have developed my own sizing over time
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HEAD CIRCUMFERENCE
|
SIZE
|
|
21.5″
|
Small
|
|
22.5″
|
Medium
|
|
23.5″
|
Large
|
|
24.5″
|
Extra Large
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