Patagonia Adult Hat Size Chart - 2021
| Small / Medium | Large / X-Large | One Size | |
| Adult Head Circumference (inches) | 21.75 - 22.75 | 22.75 - 24 | 21.75 - 24 |
| Women's (inches) | - | - | 21.25 - 23.25 |
Patagonia Kids' Hat Size Chart - 2021
| Hat Size | Age | Head Circumference |
| Small | 4 - 6 yrs | 20 - 21 in. |
| Medium | 6-10 yrs | 21-22 in. |
| Large | 10+ yrs | 22 - 23 in. |
