When you buy a full face motorcycle helmet, you should keep in mind how tight the full face helmet should be so that you can comfort ride. And after wearing a full face motorcycle helmet on your head, feel that it is perfectly fit. This helmet should not feel loose while turning the head. One way to check whether a full-face helmet is a perfect fit on your head is that. When you wear a helmet, the top padding of the helmet should not be more than 1 inch above your eyebrow.