Full Face Crash Helmets
Full face crash helmets off the greatest protection, not only in an accident but also, from the elements. They are also being further enhanced with bluetooth technology to enable communication via mobile telephone or satellite navigation.
The down side to a full face helmet is that they restrict your peripheral vision and weigh more than their open face counterparts.
On the plus side, they come in many designs including flip front and dual visors. Where there is a smaller inner dark visor for riding in bright sunlight.