It is very important to choose a helmet( road bike helmet, skate helmet, MTB helmet) to fit your head and wear it correctly. To determine your head size, ask your dealer for special head measuring tape or simply use a tap meaure. This will indicate the circumference of your head: Ensure the helmet size you choose reflects the same circumference as measured. This will ensure that the fit will be both firm and comfortable. Adjust straps until the triangle fit snugly underneath the ears. To ensure the helmet stay firmly in place. The clip buckle should be closed after adjusting the strap underneath the chin. To open the buckle, squeeze that part of the buckle that was previously inserted and it will release. The adjusted on the back of the helmet can be rotated for a larger and tighter fit.
