As the shapes of some vehicle seats are gently curved the performance pad adds another layer to the childrsquos seat ensuring the child is firmly balanced and positioned on the seatthe performance pad must be placed under the seat fabric on duo plus isofix car seats when fitting in certain carsall bmws mitsubishi colt 5 door mitsubishi colt 3 door smart forfour suzuki swift ez mz miniplease note this car seat has not passed crash testing without the use of this mat in the above carsguarant