| Circumference (cm) | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 |
| Fitted | 6 1/2 | 6 5/8 | 6 3/4 | 6 7/8 | 7 | 7 1/8 | 7 1/4 | 7 3/8 | 7 1/2 | 7 5/8 |
| XS-S | - | XS-S | XS-S | XS-S | - | - | - | - | - | |
| XS-M | - | - | S-M | S-M | S-M | S-M | - | - | - | - |
| S-M | - | - | - | S-M | S-M | S-M | S-M | - | - | - |
| M-XL | - | - | - | - | - | M-XL | M-XL | M-XL | M-XL | - |
| L-XXL | - | - | - | - | - | - | L-XXL | L-XXL | L-XXL | L-XXL |
| Adjustable | - | - | - | - | OSFY | OSFY | OSFY | OSFY | - | - |
| Adjustable Youth | OSFY | OSFY | OSFY | - | - | - | - | - | - | - |
| Snapback | - | - | OSFA | OSFA | OSFA | OSFA | OSFA | OSFA | OSFA | - |