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Determining Hat Sizes:
Use a tape measure to measure around your head (right above your ears) where you usually wear your hat. Use the chart below to determine your size.
If you don't have flexible tape measure, you can use a string or ribbon (something that won't stretch but is flexible), and then measure the length needed with a ruler or standard tape measure.

Now use the chart of hat sizes below to determine your size.
If your head size falls in between two sizes, you should choose the next larger size.
| Inches | |||||||
| Centimeters | 53 | 54 | 55 | 56 | 57 | 58 | 59 |
| Fitted Hat Size | XS | S | M | L | |||
| Hat Size | |||||||
| Inches | ||||||
| Centimeters | 60 | 61 | 62 | 63 | 64 | 65 |
| Fitted Hat Size | XL | XXL | XXXL | |||
| Hat Size | ||||||
For example, if your head measurement came out to be 22 1/4 inches, you would move up to the 22 1/2 column (the blue one above). Following it down, you would find you are a size M (Medium), or a 7 1/8 hat size.
Fitted Hat Sizes for Flex Fit Hats
flat brim caps have a range of sizes, such as S/M (Small through Medium). So a S/M hat would fit heads with measurements of 21 inches to 22 1/2 inches, or hat sizes 6 3/4 to 7 1/8.
A L/XL (Large through Extra Large) hat would fit measurements just over 22 1/2 up to 24 inches, or hat size 7 1/4 to 7 5/8.
One Size Fits Most
If a hat does not list sizes, it is a 'one-size-fits-most' hat. It will fit sizes from hat size 6 3/4 up to 7 5/8.
| Size | Hat Size | Circumference (in) |
| S | 6 1/2 - 6 7/8 | 20 1/2 - 21 5/8 |
| M | 7 - 7 1/8 | 22 - 22 3/8 |
| L | 7 1/4 - 7 3/8 | 22 3/4 - 23 1/8 |
| XL | 7 1/2 - 8 | 23 1/2 - 25 |
| Size | Hat Size | Circumference (in) |
| Youth OSFA | 6 5/8 - 6 7/8 | 20 7/8 - 21 5/8 |
| S/M | 7 - 7 1/4 | 22 - 22 3/4 |
| OSFA | 7 - 7 1/4 | 22 - 22 3/4 |
| L/XL | 7 3/8 - 7 5/8 | 23 1/8 - 24 |
| XL/XXL | 7 3/4 - 8 | 24 1/4 - 25 1/8 |
| XXL/XXXL | 8 1/8 - 8 3/8 | 25 1/2 - 26 3/8 |
| Women's S/M | 6 3/4 - 7 | 21 1/4 - 22 |
| Women's M/L | 7 1/8 - 7 3/8 | 22 3/8 - 23 1/8 |