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The TN Child Bicycle Safety Act requires that all bicycle operators under 16 years of age must wear a bicycle helmet on any highway, street, or sidewalk. A "protective bicycle helmet" means a piece of headgear that meets or exceeds the impact standards for protective bicycle helmets set by the American National Standards Institute (ANSI) or the Snell Memorial Foundation, or that is otherwise approved by the commissioner of safety. 

Every rider is always encouraged to wear a helmet.  After all, 74% of cyclist fatalities result from head injuries.  Helmet usage reduces the risk of injury in a crash by 80 percent.  When shopping for a helmet, bicyclists should be sure that the helmet fits snugly and doesn't rock from side to side when moving the head around.  When wearing a helmet, cyclists should always buckle the chinstrap, be sure that the helmet doesn't tilt either forward or backward and should beware of any cracks or damage in the helmet.