Hat Sizing
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Head Circumference
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Adult Hat Size
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| Inches | Centimeters | Fitted | Official Sizes | One Size |
| 21 1/4 | 54 | 6 3/4 | S/M | One Size Fits All |
| 21 5/8 | 55 | 6 7/8 | ||
| 22 | 55.9 | 7 | ||
| 22 3/8 | 56.8 | 7 1/8 | ||
| 22 3/4 | 57.8 | 7 1/4 | L/XL | |
| 23 1/8 | 58.7 | 7 3/8 | ||
| 23 1/2 | 59.7 | 7 1/2 | ||
| 23 7/8 | 60.6 | 7 5/8 | ||
