Trucker Cap Size Guide
| A (inches) | B (inches) | C (inches) | D (inches) | |
| One size | 20 ½-⅝ | 4 ½ | 2 ⅝ | 7 ½ |
| A (cm) | B (cm) | C (cm) | D (cm) | |
| One size | 52-1.6 | 11.4 | 6.7 | 19 |
| A (inches) | B (inches) | C (inches) | D (inches) | |
| One size | 20 ½-⅝ | 4 ½ | 2 ⅝ | 7 ½ |
| A (cm) | B (cm) | C (cm) | D (cm) | |
| One size | 52-1.6 | 11.4 | 6.7 | 19 |