A rating that combines the potential for backless boosters ... 6-year old. The Cosco Pronto is part of the Car Seats test program at Consumer Reports. In our lab tests, Booster Seats models ...

This seat can also be converted to a backless booster seat by removing the highback cushion. This Cosco Topside Backless Booster Car Seat has extra-plush padding and won’t leave marks or ...