If you've been in the ATV sport for more than five minutes, then you're probably aware that helmets are required equipment at virtually every legal ATV trail in the Northern hemisphere.
Helmets need to fit correctly in order to provide maximum protection for your head. If you can pull on a helmet and take it back off without having to spread it open a little, then that ATV helmet is to big, and is just as likely to pop off if you take a hard bump.
When you pull on an ATV helmet, the inside padding should fight snugly around your head and cheeks. It's designed to block out wind noise, and it should stay stable if you shake your head from side to side. Try wearing an ATV helmet for a few minutes before you consider buying it to be sure you can adequately see with it on.
In addition to your helmet, there are also helmet accessories that you can buy to give your ATV helmet a customized feel.
Visors can add extra sun protection for your eyes, as well as block rain from obscuring your vision. Top vents and mouth vents can also add much needed air flow on those especially warm summer days. Cheek pads can eventually become pretty rank after months of use, so why not keep an extra pair on hand for when you want to freshen up.