When trying to decide between two sizes, choose the larger size for a better fit.

Size Head Circumference (in cm) Head Circumference (in cm)
Small/Medium 22.05-22.83 56-58
Large/X-Large 23.62-24.41 60-62
Small 22.05 56
Medium 22.83 58
Large 23.62 60
X-Large 24.41 62
O/S 22.84 58