To curate this list, I put six best-selling booster seats, all recommended by child passenger safety technicians, to the test in multiple vehicles with my five-year-old and seven-year-old as testers.

My 6-year-old-son praises the two cup holders built into the seat—he uses one for a water bottle and the other for treasure (read: garbage) storage. The kids are happy. I’m happy.

Kim Ollerhead let her 6-year-old twins who require booster seats ride in a Waymo. Ollerhead, a Scottsdale, Arizona, resident, said the experience felt fun and safe.

COLORADO — Starting next year, children must be in a car seat or booster until they are nine years old and at least 40 pounds. This is up from eight years old in the previous version of the law.