The BRITAX BOULEVARD 70 Convertible Car Seat achieves optimum head safety through the combination of BRITAX SafeCell Technology, integrated steel bars, and a Versa-Tether, which work together to minimize head excursion and reduce the risk of head injury during a frontal impact. It also features easy installation, True Side Impact Protection, and innovative details for your child's comfort and safety. The seat fits children in the rear-facing position from 5 to 40 pounds, and children in the forward-facing position starting at one year old and 20 pounds, up to 70 pounds.