The SHR Flex is a frontal head restraint. It protects racecar competitors from severe or fatal upper neck injuries in high-impact crashes. Ordinarily it is unobtrusive, does not limit the racers’ helmet motions, and automatically adapts to any body type and seating configuration. In an impact, its articulated low profile design uses kinematics to activate into a biomechanical optimized restraint configuration. Integrated into a body contouring foundation, it provides an unprecedented combination of safety, comfort and fit. Its simplicity belies the sophistication of its design approach and is a breakthrough in an area mired in 20-year-old thinking.