Hat size guide - Porto - Illums

ILLUMS Porto hats

Size	Head circumference
S/M	54 - 57 cm / 21,25 - 22,44 inch
L/XL	58 - 60 cm / 22,83 - 23,62 inch

 

Practical tip: to take the measurement, place yourself at the strongest point on your head. This is in the middle of the forehead, generally 1 cm above the eyebrows, where the hat will rest.
Keep your head upright and the ribbon horizontal.