Size  
Head measurement
S/M
up to 57 cm
L/XL
up to 60 cm
XXL up to 62 cm

Practical advice: to take the measurement, you must place yourself in the strongest part of your head. The latter is located in the middle of the forehead, generally 1 cm above the eyebrows, where the hat will rest. Take the measurement with your head straight and the tape horizontal.