Go to a store and try some on.
Even helmet sizes from the same manufacturer can be different. For example, I found the Giro Atmos and Ionos fitted differently, despite being very similar looking helmets.
True ive got a Giro Monza at the moment and that fits ok, i had a fit of a few at the weekend but they didnt have a Kask to try
wasnt much between the others that i noticed tho
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