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Neck injuries occuring in rear impacts, often referred to as “whiplash” injuries, have become one of the most common types of injury in car accidents and the number is growing steadily in many countries. One effect of this is that more than half of the medical insurance compenstaion to car accident victims in, for instance, the United States or Germany is related to “whiplash” injuries. The alarming increase in injury incidence has increased research and product development efforts worldwide. In 1997 (US early 1998), SAAB introduced the SAAB Active Head Restraint (SAHR) in the all-new 9-5 vehicle as a first application of crash activated systems to mitigate whiplash injuries. In addition to the active head-restraint, the SAHR system comprises design features in the seat-back to control and distribute those loads on the occupant that are generated in rear impacts or during rebound from the restraint system in frontal impacts.