Learn how to choose the right size for your ski or snowboard helmet with this video provided by Wed'ze! br br First, measure your head circumference with a measuring tape. Each helmet size corresponds to a range: br - M: 51-55 cm br - L: 56-59 cm br - XL: 60-64 cm br br Do not choose a helmet that is too small because you will not be able to put it on correctly and it will be uncomfortable. br Do not choose a helmet that is too big either because it will tend to move and rotate around your head and may even interfere with your vision. br br A perfectly-sized helmet should move slightly on the sides and front but remain firmly in place. br br Adjust the strap under your neck leaving a gap of one centimeter. Do the same for the strap on the side.