John Whitaker Riding Helmet Size Guide
| Size | Head Size |
| Small | 51-54 cm |
| Medium | 55-58 cm |
| Large | 59-62 cm |
*To measure your head, place a tape measure one finger’s width above the brow bone and, ensuring the tape stays flat, measure the circumference of the widest part of your head - this should just skim the tops of your ears.
