Purchase an additional KeyFit Max Base to make transitioning your Chicco baby car seat between vehicles even easier. A convenient addition to your baby travel gear, the KeyFit Max Base offers secure attachment for all Chicco KeyFit, KeyFit 30, KeyFit 35 and KeyFit Max Infant Car Seats. The integrated anti-rebound bar provides added stability and more legroom for to comfortably maximize rear-facing use. Top-rated, innovative safety features make the KeyFit Max Base easy to install and use correctly, every time. Premium LATCH connectors and a SuperCinch force-multiplying tightener helps achieve a secure fit with a fraction of the effort. One-hand ReclineSure spring-loaded leveling foot works in tandem with RideRight bubble levels to help verify and achieve proper car seat angle. The LockSure steel-reinforced belt system helps achieve a secure fit with the vehicle belt.