SHR Flex is a frontal head restraint safety system for professional and recreational racecar competitors—protecting them from severe or fatal upper neck/basilar skull fracture injuries in high-impact crashes, while providing unprecedented comfort and mobility during normal driving.  It is a breakthrough, patent-pending design in an area of race safety that has not seen significant innovation in nearly 20 years. It is the only restraint system that is low-profile during normal driving, but then uses the kinematics of the impact to kick into a high position only when protection is needed.