BeSafe iZi Modular is a modular child seat system, consisting of one Isofix compatible base and two child seats which conform to the EU standard (i-Size). When the child grows out of the baby seat, the next seat is used on the same base. The base module can be extended to allow the child more legroom, which means children up to the age of about four years (105 cm tall) can be transported facing the rear.