To arrive at your correct head size, measure the circumference of your head in centimetres. This should be measured at the point which the hat sits on your head. Between 1-2 cm above your ears as shown in the picture. Then find th corresponding measurement on the chart below.
Size
Small
Medium
Large
X Large
XX Large
CM
55
57
59
61
63
Inches
21.5
22.25
23
23.75
24.5
If your head measurement is inbetween sizes then go up a size.
