Quote:
Originally Posted by PassionateWriter 
ok, so for my 10 yo (as an example), he can use the Ollie Clek as long as the seat belt fits, even though it says only up to 57" ?(its a backless booster and he hated the booster w/ a back and at 10, i feel i need to respect his preferences a bit, yk?)
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Yes. He needs to be in a backless booster until he passes the 5 step test.
Quote:
Originally Posted by PassionateWriter 
its a bit late for my 10 yo at this point, but im a bit confused about keeping kids in a highback booster after 57". i know the Frontier goes to 60" and thats the next seat my 2.5 yo will have (after he reaches 35 lbs. and has to go FF'ing). But is there another seat that is over 57" inches (booster, highback and/or backless). Also, from what i am understanding, as long as the booster seat (highback or backless) fits the child (seat belt wise), you can disregard the height limitation? sorry if im being dense about this but i havent ventured into boosters in as much detail as i have the convertibles at this point.
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Height limits on boosters are just like height limits on harnessed seats--an approximation. As you know, you can have 10 different 57-inch tall children who can all fit the booster differently. Some will have long legs and short torsoes, some will have short legs and long torsoes, some will be in the middle. Boosters have a written height limit on them because they are required to by FMVSS213, and they state 57" because that is the point at which most children will fit properly into an adult seatbelt.
The Frontier is one of the tallest boosters available. As long as the child fits into the booster by weight and height (and by height I mean the child is within the belt guide) it is not dangerous to be in a booster beyond the stated height limit. Again, the SIP provided by a high back booster is very beneficial.
There used to be a great video on youtube showing crash tests of a side impact and a dummy in a high back booster with very deep side wings (like the European boosters, or the Parkway, Start, Vivo, Frontier or Monterrey), a high back booster with shallow wings (for instance the Graco Turbo, or the Evenflo or Cosco boosters), and a backless booster. In the deep winged booster, the child's head and body was contained and very well protected by the EPS foam. In the shallower booster, the seat and EPS foam still absorbed alot of the energy, but the child's head was not contained and struck the window/side panel. In the backless booster, of course there was nothing absorbing the energy and the child not only struck the side of the vehicle but also there was much movement of the child's whole upper body after the crash. So you can see why the high-back portion of a booster is important!
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