The Britax Allegiance Convertible Car Seat is designed with SafeCell Impact Protection – a system of patented safety features designed to help keep baby safe and sound. Its deep foam-lined shell provides side impact protection to help surround baby in safety. It has a 10-Position Harness that easily adjusts to proper harness positions for your growing baby. Its latch connectors lock into place with a click, and are released with the push of a button. Rearward Facing: 2.3 – 18 kg, Forward Facing: 9.1 – 29.4 kg.