All sizes given are subject to manufacturing tolerances (+/- 2%).
Men's
| a. | b. | |
| Extra Small | 70cm | 48cm |
| Small | 72cm | 51cm |
| Medium | 75cm | 53cm |
| Large | 78cm | 55cm |
| Extra Large | 81cm | 57cm |
| XXL | 84cm | 59cm |
| 3XL | 88cm | 61cm |
| 4XL | 91cm | 64cm |
| 5XL | 95cm | 66cm |
Kids'
| Size | a. | b. |
| 4 Years | 48cm | 36cm |
| 6 Years | 52cm | 38cm |
| 8 Years | 56cm | 40cm |
| 10 Years | 60cm | 42cm |
| 12 Years | 64cm | 44cm |
| 14 Years | 68cm | 46cm |