The CYBEX Sirona S is the first Convertible Car Seat in North America to feature an innovative 360° rotatable seat with a load leg, making switching between rear-facing and forward-facing positions quick and easy.
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Availability: Out of stock
Article number: 519004449

The Sirona S load leg stabilizes the seat and can significantly reduce crash forces. These features, combined with an EasyLock™ bar for quick, simple and secure installation, offer advanced safety protection for children — and greater peace of mind for parents.

With SensorSafe™ technology, you'll gain instant insight into your child's well-being—right to the SensorSafe app on your phone. Built into the chest clip of CYBEX car seats, SensorSafe provides alerts when unsafe situations arise including if a child unbuckles themselves; if the back seat has become too warm or too cold, if a child has been seated for too long, and if the driver accidentally leaves the child behind.


  •  Innovative, one-hand 360° rotatable seat allows parents to easily get their child in and out 
  • Load leg stabilizes the car seat and can reduce rotation in certain crashes by up to 30% 
  • Only Convertible Car Seat in North America with a one-time vehicle belt installation for both rear-facing and forward-facing mode 
  • EasyLock™ bar reduces force needed up to 4x for quick, simple and secure installation 
  • SensorSafe technology uses a Bluetooth enabled chest clip to send mobile app alerts when potential unsafe situations arise 
  • 12-position recline adjustment even while seat is in use 
  • Linear Side-impact Protection absorbs up to 25% more impact in a collision* 
  • Anti-rebound design reduces car seat rebound movement 
  • Magnetic buckle holders make entry and exit from the seat a breeze 
  • Dishwasher safe cup holder can be positioned on either side of seat 
  • 12-position, height-adjustable headrest with no-rethread harness 
  • Dual-level indicators help ensure the proper car seat angle 
  • Steel reinforced frame provides strength and durability 
  • Harness pads and 3-position padded buckle provide extra comfort 
  • Removable newborn insert provides support for small babies 
  • Innovative one-pull LATCH removal system 
  • LATCH Connection storage inside the base when not in use 
  • Rear-facing from 4 lbs. to 50 lbs. Forward-facing from 22 lbs. to 65 lbs.

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