The new CYBEX Eternis S SensorSafe All-in-One Convertible Car Seat is the only seat your child will need from birth and beyond. With three modes - rear-facing, forward-facing and booster, the Eternis S SensorSafe All-in-One Convertible Car Seat is designed for use from birth up to 120 lbs. Eternis S SensorSafe All-in-One Convertible Car Seat offers an adjustable Linear Side-impact Protection (L.S.P. System), which absorbs up to 25% more impact forces in the event of a side impact collision* and a patented 3-position reclining headrest, which helps prevent the child's head from falling forward while asleep, guiding the head and neck into a safe position. These features, combined with a steel reinforced frame for strength and durability provide advanced child safety protection and peace of mind.