Hats Fedora - Coolibar 

Size Head circumference (cm)
S/M
to 57,5
L/XL
to 58,5
XXL to 61,5

Practical tip : to take the measurement, you should stand at the strongest point of your head. This is in the middle of the forehead, usually 1 cm above the eyebrows, where the hat will rest. Take the measurement with your head upright and the tape horizontal.