| Size | Headpiece | Noseband | Cheek Strap |
| Pony | 61cm | 20.5cm | 6cm |
| Cob | 66cm | 22cm | 6.5cm |
| Full | 71cm | 23.5cm | 7cm |
Size Guide Hy Equestrian Synergy Head Collar
| Size | Headpiece | Noseband | Cheek Strap |
| Pony | 61cm | 20.5cm | 6cm |
| Cob | 66cm | 22cm | 6.5cm |
| Full | 71cm | 23.5cm | 7cm |