Many booster seats aren’t up to the job of improving safety belt fit for children

Booster seats are meant to do one thing — elevate children so that safety belts designed for adults are in the right position to restrain kids during a crash. Thirteen of the 41 belt-positioning booster seats the Insurance Institute for Highway Safety evaluated with the University of Michigan Transportation Research Institute did such a poor job of improving the fit of lap and shoulder belts for children that the Institute doesn’t recommend them at all.