Children grow fast and their needs change therefore their car seat has to do the same the izi combi x4 isofix grows in height in several steps and the innovative sliding isofix arms give the child additional space as the child grows taller the car seat can easily be adjusted to provide just as much leg room as necessary compact and space saving installation the isofix arm length can be adjusted in steps this unique innovation from be safe means you can adjust the car seat the way you want