To ensure maximum safety, the helmet should fit perfectly and feel comfortable. This means that it should not be either too tight, because it would be impossible to wear it for long periods of time, or too large, because it would not provide enough protection in the case of impact, or it could slip to the side or off your head while driving.
1. To determine the correct helmet size, the first thing to do is to measure your head by passing a tape measure around it a couple of centimeters above the eyebrows and ears.
2. Based on the helmet size that you have just determined, now you must try it on to make sure that it fits properly and feels comfortable. Pull both parts of the chinstrap to the side (see figure) and put on the helmet, sliding it from the back of the head to the front.
3. At this point, make sure that all the liner parts (sides, top, front) adhere to your cheeks, the top of your head and forehead. Keep your head still and try to turn the helmet slightly to the right and left, then move it up and down and backward and forward (see figure).
The helmet adheres properly if it pulls the skin on the cheeks and forehead, so if it turns too easily around your head it is too big and you should try a smaller size.
4. The last step is to fasten the chinstrap as tightly as possible but without hurting and with your head bent forward, try to remove the helmet by pulling it from the back to the front (see figure).
If the helmet comes off easily, it is not the right fit for you.
5. If the size seems to be right, keep the helmet on for a few minutes to make sure that it does not hurt or there are no pressure areas. If you are not sure, repeat the steps above until you find the helmet that fits the best. Always choose the smaller size if you are undecided between two different size helmets that both feel comfortable