You can measure your head with a soft tape measure by wrapping it from just above your eyebrows all the way around your head. Or grab some string and wrap that around your head and measure with your regular tape measure. IT'S IMPORTANT THAT YOU DO NOT PULL IT TIGHT!!!!
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To get the right size cap, measure the circumference of your head and use this chart to find your size. Make sure not to get it too snug.
Extra Small
6 1/2……….21 1/4 – 21 3/8’’
6 5/8……….21 3/8 – 21 1/2’’
Small
6 3/4……….21 1/2 – 21 5/8’’
6 7/8……….21 5/8 – 21 3/4’’
Medium
7……………..21 3/4 – 22 1/8’’
7 1/8……….22 1/8 – 22 1/2’’
7 1/4……….22 1/2 – 22 7/8’’
Large
7 3/8……….22 7/8 – 23 1/4’’
7 1/2……….23 1/4 – 23 5/8’’
7 5/8……….23 5/8 – 24’’
Extra Large
7 3/4...........24 - 24 3/8’’
7 7/8...........24 3/8 - 24 3/4’’
8.................24 3/4 - 25 1/8’’