The kidfix ii xp offers safety reassurance for parents and comfort for the older child this highback booster seats innovative xp pad gives advanced frontal protection its secure guard patent pending ensures optimal lap belt positioning and its deep softly padded side wings offer cocooning safety for growing heads and neck from 4 to 12 years features reduced frontal impact xp pad diverting up to 30 source britax tests 2013 of energy forces away from neck optimal lap belt positionin