Chicco KeyFit 30 Infant Car Seat & Base accommodates infants from 4 to 30 lbs. The car seat harness has one-pull tightening & loosening for quick harness fitting. The thickly-padded infant insert gives extra support for a smaller baby around the head, neck, back & bottom. The carrier shell is lined with energy absorbing foam. It features an innovative LATCH management system, easy belt routing and a spring-loaded leveling foot to make the infant car seat installation easy. The "one-pull" centrally located tightening strap has made securing the LATCH attachment simple.