Skip to product information


Regular price
Regular price
Sale price
Color - Urban Black


The CYBEX Sirona S is the ONLY convertible car seat to feature a 360° swivel seat with a load leg, linear side impact protection, and SensorSafe technology. Built into the chest clip, SensorSafe provides real-time in-app alerts when potentially unsafe situations arise including if a child unbuckles the chest clip, if the back seat becomes too warm or too cold, and if the driver unintentionally leaves the child behind. These features offer advanced safety protection for children and greater peace of mind for parents.

  • ONE-HAND 360° SWIVEL SEAT: For easy loading and unloading of your child
  • LOAD LEG: Absorbs energy and reduces crash forces on the child by up to 30% in a front impact collision*
  • ONE-TIME VEHICLE BELT INSTALLATION: Allows seamless transition from rear-facing to forward-facing mode without having to re-install
  • EASYLOCK™ BAR: Reduces force needed up to 4x for quick, simple and secure installation
  • SENSORSAFE TECHNOLOGY: Bluetooth enabled chest clip sends mobile app alerts if a child unbuckles the chest clip, if the back seat becomes too warm or too cold, and if the driver unintentionally leaves the child behind
  • 12-POSITION ON THE FLY RECLINE: Adjust even when the seat is in use
  • LINEAR SIDE-IMPACT PROTECTION (L.S.P.): Reduces collision forces by up to 25% in a side impact crash*
  • ANTI-REBOUND BASE: Reduces rebound forces in a rear or front impact crash
  • REAR-FACING LONGER: Up to 50 lbs.
  • MAGNETIC BUCKLE HOLDERS: Keeps harness out of the way for easy loading and unloading of your child
  • DISHWASHER SAFE CUP HOLDER: Can be positioned on either side of seat
  • 12-POSITION ADJUSTABLE HEADREST: Harness adjusts with the headrest for a proper fit as your child grows
  • DUAL-LEVEL INDICATORS: Clearly indicate the proper car seat angle from either side of the seat
  • STEEL REINFORCED FRAME: Provides strength and durability
  • 3-POSITION PADDED BUCKLE: Allows for a secure fit while providing extra comfort for your growing child
  • REMOVABLE INFANT INSERT: Ensures proper fit and support for babies

*As compared to the same car seat without this feature


  • Child Age Minimum: newborn
  • Child Age Maximum: 8 years
  • Child Weight Minimum: 4 lbs.
  • Child Weight Max: 65 lbs.
  • Rear-Facing Mode Weight Limitation: 4-50 lbs.
  • Rear-Facing Mode Height Limitation: 17"-49"
  • Forward-Facing Mode Weight Limitation: 22-65 lbs
  • Forward-Facing Mode Height Limitation: 28-49 in
  • Forward-Facing Mode Age Limitation: at least 22 lbs
  • Forward-Facing Mode Fit Limitation:  top of ears below the top of the headrest


  • Dimensions: 24.5"D x 19"W x 25.5"H
  • Weight: 30.4 lbs.


We Also Love...