Head shape can play a factor in helmet fit. So our size guide is designed a starting point and will work for most people, there are of course exceptions.
Rounder heads will usually fit based on measurements, but if you have a more oval head shape, you might be better suited to a larger size.
If your head measurement falls in between sizes, a good idea is to go up a size. Helmets use common shell sizes with different size liners. It is possible to resize a medium to a large by changing the cheek pads and liner.
How To Measure Your Head:
Using a flexible tape, measure around the circumference of the widest part of the head, above the ears. Please refer to your actual measurement and do not rely on your existing helmet size.