Measurements are in inches and were taken from the garment laid flat unless otherwise stated.
| Size | USA hat size | Head circumference (in) | Head circumference (cm) |
|---|---|---|---|
| S | 6 3/4 | 21.125 | 54 |
| S | 6 7/8 | 21.5 | 55 |
| M | 7 | 21.875 | 56 |
| M | 7 1/8 | 22.25 | 57 |
| L | 7 1/4 | 22.625 | 58 |
| L | 7 3/8 | 23 | 59 |
| XL | 7 1/2 | 23.5 | 60 |
| XL | 7 5/8 | 23.875 | 61 |