The Chicco MyFit Harness + Booster Car Seat is designed for an easy transition from forward-facing five-point harness toddler car seat to big kid booster mode. Nine headrest positions accommodate growth throughout both modes and work together with a four-position recline to support proper posture. An extra-deep ErgoBoost seat with dual-density foam padding is ergonomically designed for superior comfort. A slim car seat with space-saving features, MyFit fits three-across in the backseat without compromising child (or passenger) comfort. The two CupFolders conveniently fold in when not in use to maximize space for a convenient travel car seat. MyFit includes EPS energy-absorbing foam that surrounds the head and torso plus a steel-reinforced frame for superior impact protection and stability. For simple and accurate installation, the MyFit forward-facing car seat is designed with a four-position ReclineSure leveling system and RideRight bubble levels help achieve and verify proper angle in the vehicle seat. Premium LATCH connectors and a LockSure seat belt locking system with wide routing facilitate a secure installation with LATCH or the vehicle seat belt. A padded, no-rethread harness with a one-pull tightener is easy to adjust and the harness can be stored to create a grow with me car seat with shoulder and lap belt guides for big kids four years and up. In harness mode, the MyFit is designed for children who are at least 2 years old, between 26.5-65 lbs (12-29.5 kg) and up to 54” (137 cm) tall In booster mode, the MyFit is designed for children who are at least 4 years old, between 40-100 lbs (18-45.3 kg) and between 38-57” (97-145 cm) tall