SIZING: (HIGH = 2.5" Thick) (MED = 2.0" Thick) (LOW = 1.0" Thick) If you've ever gone for a long ride in a UTV, chances are you've found out the hard way exactly how heavy your head really is. The bouncing, bobbling, swaying for hours with a helmet on can strain your muscles, and cause soreness and discomfort. The NecksGen UTV Helmet Support is designed purely with comfort in mind. As the name suggests, this easy to use foam collar simply supports your helmet to help you keep your eyes on the road. If you are racing, you need a head and neck restraint, plain and simple. This is NOT a head and neck restraint, and it does not protect you in a crash like a head and neck restraint will. If you aren't racing, and you are just out playing in the dunes or the trails, and you want a little extra support, the UTV Helmet Support can offer a helping hand to stop the bobble-head effect.