A DOT-compliant motorcycle helmet is a rider's greatest defense against death or permanent disability in a crash.
According to the Insurance Institute for Highway Safety (IIHS), wearing a helmet decreases your chance of death in an accident by 37 percent. The National Highway Traffic Safety Administration reports that as of June 2009, 20 states and the District of Columbia had mandatory helmet laws applicable to all riders, and forgoing a helmet in these states can result in a stiff fine.
Helmet Care
Storing a helmet improperly decreases its ability to protect you. Store your helmet away from gas, cleaning fluids and exhaust, as their fumes can degrade helmet materials. Helmets should be replaced if they were involved in a crash, because the damage from the force of impact reduces their protective capabilities.