| Infants'/ Toddlers' | XX-Small | X-Small | Small | Medium | Large |
| Age | 0 - 3 m | 3 - 6 m | 6 - 18 m | 18 m - 3 yrs | 4 - 5 yrs |
| Head Cirum. | 15.5 - 16.5 | 16.5 - 17.5 | 17.5 - 19 | 19 - 20 | 20 - 21 |
| Kids' | Small | Medium | Large |
| Age | 4 - 6 yrs | 6 - 10 yrs | 10 yrs and up |
| Head Cirum. | 20.5 - 21 | 21 - 22 | 22 - 23 |
Measurements stated in inches unless otherwise indicated.