Eternis S SensorSafe Convertible Car Seat

by Cybex




The new CYBEX Eternis S All-In-One 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 is designed for use from birth up to 120 lbs. The Eternis S 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.


  • Rear-facing from 4 lbs. to 50 lbs. Forward Facing from 22 lbs. to 65 lbs., Belt-positioning Booster from 40 lbs. to 120 lbs.
  • Adjustable Linear Side-impact Protection (L.S.P. System) absorbs up to 25% more impact forces in the event of a side impact collision*
  • Patented 3-position reclining headrest helps prevent the child's head from falling forward while asleep, keeping the head and neck in a safe position and ensures a comfortable sleeping position -Steel reinforced frame provides strength and durability
  • Energy absorbing shell and base help reduce the forces felt by the child in a collision -In-seat recline provides correct ergonomic positioning and extra legroom, allowing your child to safely ride rear-facing longer
  • 12-position, height-adjustable headrest with an integrated no-rethread harness for protection that grows with your child
  • 6-position one-hand adjustable recline for the best fit to your car
  • Magnetic buckle holders for easy entry and exit from the seat
  • Removable newborn inlay provides additional support for very small babies (4 lbs. to 11 lbs.)
  • Removable cup holder can be positioned on either side and is dishwasher safe for easy clean up
  • Cozy harness pads and 2- position padded buckle for comfort
  • Dual Belt adjusters to ensure a tight fit
  • Dual-level indicators to help ensure the proper angle
  • Innovative one-pull LATCH removal system
  • LATCH Connection storage provided under the seat when not in use
  • Designed and engineered in Germany


  • Rear facing weight range: 5-50 pounds
  • Rear facing height range: 17-48 inches tall or until the child’s head is within 1 inch of the top of the headrest or backrest, whichever is higher. 
  • Forward facing height range: 28-49 inches tall 
  • Forward facing weight range: 22-65 pounds  
  • Booster mode weight range: 40-110 pounds 
  • Booster range height range: 44-57 inches tall 
  • Lower anchor weight limit: 40 pounds 
  • Seat weight: 25 pounds

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