Britax Renaissance SI Baby Car Seat Prague is pioneering car seat with Adjusta-Fit System and Belt Tensioner. The Adjusta-Fit System allows you to simply adjust the harness and headrest for maximum comfort. This car seat is stage 1 - 9 months to 4 years (9-18kg). Britax Renaissance car seat has deep, softly padded side wings for optimum side impact protection. Its unique seat-belt tensioner helps to ensure a secure fit and the five recline positions help to ensure a comfortable journey. This baby car seat has slim base for a better fit in modern sculpted seats and the unique pitch control system reduces forward movement in a crash.