The first and only rule by which you can immediately understand your size or not – it should fit snugly at all points on the head (forehead, nape, cheeks). Fit snugly, but don't push. Open the visor, stand in the helmet for 2-3 minutes, if it sits tightly and does not create any pain – this is your size. Keep in mind that in the process of using the pillows a little crush and it will be a little freer. If you choose a helmet remotely, on the page with any motorcycle helmet, click "Find your size" and follow the size selection wizard. For online orders, returns and exchanges are also valid.