KEP Helmet Size Guide

MEDIUM SHELL
CM	Inches
51	6-3/8
52	6-1/2
53	6-5/8
54	6-3/4
55	6-7/8
56	7
57	7-1/8
58	7-1/4

LARGE SHELL
CM	Inches
59	7-3/8
60	7-1/2
61	7-5/8
62	7-3/4