The Colonial model was used by the British Empire during their conquest in Asia. Still today, this model is very popular in the UK. Also known as the Optimo.
If you are not sure of your exact hat size you can measure the circumference around your head by using a tape measure or if you do not have one you can use a string and then measure it against a ruler.
The measurement level should be where a hat would normally rest, that is above the ears and above the eyebrows ridges. While measuring keep the tape firm but not tight.
Check the size chart given below. For in-between measurements use the next size up.
|Small||6 7/8||55||6 3/4||55||21 3/4||55|
|Medium||7 1/8||57||7||57||22 1/4||57|
|Medium||7 1/4||58||7 1/8||58||22 5/8||58|
|Large||7 3/8||59||7 1/4||59||23||59|
|Large||7 1/2||60||7 3/8||60||23 1/2||60|
|Extra Large||7 5/8||61||7 1/2||61||23 7/8||61|
|Extra Large||7 3/4||62||7 5/8||62||24 5/8||62|