Industrial Helmet Size Chart

Size Hat Size Metric (CM) Inches
XX Small 6-3/4 to 6-7/8 54 to 55 21-1/4 to 21-5/8
X Small 7 56 22
Small 7-1/8 57 22-3/8
Medium 7-1/4 to 7-3/8 58 to 59 22-3/4 to 23-1/8
Large 7-1/2 to 7-5/8 60 to 61 23-1/2 to 23-7/8
X Large 7-3/4 62 to 63 24-1/4
XX Large 8 to 8-1/2 64 to 68 25-1/8 to 26-3/8