Size	Measurement
0 - 6m	Up to 43 cm
6 - 12m	Up to 46 cm
12 - 18m	Up to 48 cm
18 - 24m	Up to 51 cm
2 - 3yrs	Up to 51.5 cm
3 - 6yrs	Up to 52 cm
6 - 10yrs	Up to 53 cm
M / L	Up to 57 cm
L / XL	Up to 60 cm