SIZING CHART

NZ (UK & Australia) Diameter (mm) Circumference (mm) USA
J 15.5 48.69 4.75
K 15.9 49.95 5.25
L 16.3 51.24 5.75
M 16.7 52.46 6.25
N 17.1 53.72 6.75
O 17.5 54.98 7
P 17.9 56.23 7.5
Q 18.3 57.49 8
R 18.7 58.75 8.5
S 19.1 60.00 9
T 19.5 61.26 9.5