The iZi Flex FIX i-Size offers generous possibilities for adjustments, to fit children from 100 to 150 cm in height. The booster seat is also easily adjusted to the child’s height by use of one of the handles – there is one handle on each side so you can adjust it from any side. This can be done with the child sitting in the seat, so you can adjust it accurately and quickly. The headrest should be adjusted so the vehicle seat belt is guided 90 degrees through the shoulder belt guiders, over the child’s shoulders. You can also adjust the reclining feature of the iZi Flex FIX i-Size for a perfect sitting position – this must be done before you put on the seat belt, in order to avoid slack in the seat belt. The seat belt should be tightened properly, and the lap belt guider will put the seat belt in the right position over the child’s body.