Helms:
Celt and Norses browline circumference:
Small = 22.5-23.5
Medium = 23.5-24.5
Bascinets browline circumference:
Small = 21.5 - 23
Medium = 23 - 24
Large = 24 - 25
H-H Head Height Measurement (only for custom helms)
H-W Head Width Measurement (For Custom Sizing)
H-L Head Length Measurement (For Custom Sizing)