This clever 4D system means that the car seat can grow with your child as it adjusts in 4 different directions, all independently of each other. The height of the headrest can be adjusted into 5 different positions in addition to the 3 positions the upper part of the backrest can be placed in. As your child grows, so does the width of their shoulders, therefore the adjusting side protection on the seat adds an additional 10cm to the width. Finally, the seat can be easily adjusted with one hand into 1 of 5 recline positions. The Viaggio 2-3 Flex uses your 3 point seatbelt to secure your child in the car but if you do have ISOFIX points in the car, the seat does have an integrated Surefix Base which ensures stable cornering but it is not a requirement to use this. Peg Perego have also added a 'Blind Lock' system, meaning the car seat cannot be released from the ISOFIX points 'by accident' (or by an older brother or sister!). If you need to store or move the car seat from car to car, it h