Motorcycle helmets are designed to protect motorcycle riders from head injuries. When buying a motorcycle helmet, check if it has a DOT or Snell sticker, which means that the helmet meets U.S. or international safety standards. There are five basic types of motorcycle helmets: full face helmets, modular helmets, open face helmets, half helmets, and motorcross helmets. Full face helmets provide maximum protection. Because motorcycle helmets are designed to break in a crash to absorb the forces of impact, they are easily damaged. Change your helmet if you've damaged it in an accident.