Measuring the circumference is an important step for choosing your helmet a incorrect size would result in a helmet or too wide or too tight and this would result in a reduction of driving comfort.
The measurement should be done using a centimetre and positioning it as in the photo around its head.
|Head circumference in CM||50-51||52-53||54-55||56-57||58-59||60-61||62-63||64-65|
|Men's helmet size||xxx||x||s||m||i||xl||xxx||xxxl|
|Head circumference in CM||49-50||51-52||53-54||55-56||57-58|
|Size female helmet||xxx||x||s||m||i|