A. Nearly every authority on the subject suggests that riders wear certified motorcycle helmets, which multiple studies indicate prevent life-altering and fatal traumatic brain injuries. Missouri only requires certain riders to use protective headgear. Missouri law (Mo. Rev. Stat. § 302.020) requires all riders under the age of 26, riders with instruction permits (regardless of age), uninsured riders, and all passengers to wear certified helmets. Riders over the age of 26 with unrestricted motorcycle licenses and proper insurance policies are not required to wear helmets in Missouri.