Measure your hat size right - Size Chart
You take a tape measure and measure your head circumference at the longest point over your forehead and the back of your head. The measurement you get in centimeters represents your hat size. If you don't have a tape measure, simply take a piece of string and hold it against a folding rule or ruler after you have taken the measurement. Measure so that there is still about a little finger width of air.
Standard | cm | UK | US |
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XS | 52 & 53 | 6 3/8 & 6 1/2 | 6 1/2 & 6 5/8 |
S | 54 & 55 | 6 5/8 & 6 3/4 | 6 3/4 & 6 7/8 |
M | 56 & 57 | 6 7/8 & 7 | 7 & 7 1/8 |
L | 58 & 59 | 7 1/8 & 7 1/4 | 7 1/4 & 7 3/8 |
XL | 60 & 61 | 7 3/8 & 7 1/2 | 7 1/2 & 7 5/8 |
XXL | 62 & 63 | 7 5/8 & 7 3/4 | 7 3/4 & 8 |