The Chicco OneFit Max is an all-in-one car seat for children 5 to 100 lb. that transitions from harnessed mode to booster mode as your child grows. In CR’s tests, the Chicco OneFit Max provides excellent crash protection and easy, secure installation in both rear-facing and forward-facing positions with either LATCH or seat belt installations. However, the manufacturer recommends using the seatbelt and tether strap for installation when forward-facing, rather than the LATCH system. CR child passenger safety experts recommend rear-facing until a minimum of age 2, although the OneFit Max allows forward-facing at age 1 year.
The OneFit Max’s longer seat shell provides slightly more legroom for your child when rear-facing than the OneFit LX, though the rear-facing limit is still 40 lb., the same as the LX model. Given the longer seat shell on the Max, we found that it takes up more room in the back seat, and the booster mode may be a better fit for older children whose legs may bend over the front edge more naturally than younger kids with short legs. (Not being able to bend their knees over the edge of the seat commonly results in kids slouching in boosters and a poor lap belt fit.)
CR’s testers note that the seat is bulky and fairly heavy at 27 pounds, making it harder to move the seat between cars. The OneFit Max may also not be a great fit for cars with smaller backseats or short seat cushions, as the seat base overhang may exceed the car seat’s max allowance of three inches.
This seat may be a good choice for:
- Families who want to purchase an all-in-one car seat (as opposed to using an infant seat for the first year and then switching to a convertible seat)
- Families who don’t need to move their car seat between multiple cars
- Anyone who needs a simple and straightforward installation, thanks to the push-on LATCH connectors and seat belt lockoff
- Those who want a roomier rear-facing experience for their child