The bumper is your vehicle's first line of defense against front and rear collisions. If you want added protection, though, you can back up the bumper with a bumper absorber. Made of Styrofoam or durable plastic, this bumper accessory is mounted between the bumper and the bumper cover. The bumper absorber takes and dissipates most minor collision impact. In general, bumper absorbers are designed to absorb minor collision energy by crushing or collapsing, thus reducing physical damage to the vehicle structure.