Sits no child in Cybex Pallas 2-fix, then it must acc. To instructions (and in practice, even with the Isofix variant) are backed up with the normal harness. But this is pretty annoying, especially as long as the table has to be used. This simple strap can be the upper part of the seat with the headrest connect. Thus, the seat is also secured in the upper part and tilting in case of an accident not forward. Only the price (hence only 4 stars) can be discussed, because man could also get corresponding tear-resistant belts / ropes. Is certainly cheaper, but looks may then also accordingly. By the way, the typical stretchable "luggage spider" and the like are by no means suitable !!!