Champion Size Guide
Hat Guide
| English Helmet size | Head Circumference CM | Jockey Sizes |
| 6 | 49 | 000 |
| 6 1/8 | 50 | 000 1/2 |
| 6 1/4 | 51 | 00 |
| 6 3/8 | 52 | 00 1/2 |
| 6 1/2 | 53 | 0 |
| 6 5/8 | 54 | 0 1/2 |
| 6 3/4 | 55 | 1 |
| 6 7/8 | 56 | 1 1/2 |
| 7 | 57 | 2 |
| 7 1/8 | 58 | 2 1/2 |
| 7 1/4 | 59 | 3 |
| 7 3/8 | 60 | 3 1/2 |
| 7 1/2 | 61 | 4 |
| 7 5/8 | 62 | 4 1/2 |
| 7 3/4 | 63 | 5 |
| 7 7/8 | 64 | 5 1/2 |
| 8 | 65 | 6 |
