The Chicco® MyFit® Harness + Booster Seat is designed to grow with children from toddler through big kid, with easy transition from five-point harness to vehicle seat belt. A nine-position extended headrest and easy transition to a belt-positioning booster accommodate years of growing. The MyFit® is designed with smart functionality that makes it the easiest to install simply, accurately, and securely. Every time. For reassuring protection, DuoGuard™ side-impact protection offers two layers of protection for two zones with a rigid shell and EPS energy-absorbing foam that surround the head and torso. The seat shell is also reinforced with a steel frame for superior impact protection.