Size Guide

UK	US	EU	Diameter	Circumference
J	5	49	15.5 mm	48.7 mm
K	5.5	50	15.9 mm	50.0 mm
L	6	51	16.3 mm	51.2 mm
M	6.5	52	16.7 mm	52.5 mm
N	7	54	17.1 mm	53.8 mm
O	7.5	55	17.5 mm	55.1 mm
P	8	56	17.9 mm	56.3 mm
Q	8.5	57	18.3 mm	57.6 mm
R	9	59	18.8 mm	58.9 mm

Between sizes? We suggest the larger one.