Sirona S with SensorSafe

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The CYBEX Sirona S is the only convertible car seat to feature a 360° rotatable seat with load leg stability, linear side impact protection, and SensorSafe™ technology.

  • Innovative one-hand 360° rotatable seat
  • Load leg
  • SensorSafe™ Technology
  • Easy Lock Bar™
  • Linear Side Impact Protection (L.S.P.)
  • 12-Position on the fly recline
  • Anti-Rebound base
  • Magnetic buckle holders

Raddl Report Card

5-Star Summary 

63% of reviewers praise the Cybex Sirona S for its comfort, safety, and convenience features, such as the 360-degree swivel, side impact protection, and SensorSafe technology. Reviewers appreciate the convenience of the swivel and the easy-to-use level indicator. Overall, the car seat is described as luxurious and high-quality and is highly recommended by users who find it to be a safe, comfortable, and convenient solution for transporting their babies in cars.

2-3-4 Star Summary

31% of reviewers found the car seat to be comfortable and convenient due to its ability to swivel. However, some had difficulty with installation, and the seat getting stuck. Some reviewers had concerns about the car seat’s size and weight, describing it as heavy, difficult to work with, and transfer between vehicles. Overall, the car seat is generally well-liked and would be especially helpful for younger children, but some had reservations about its usability and installation.

Quick Words

360-degree rotation 5-point harness bulky comfortable easy to use expensive heavy installation luxury maneuverability plush fabric revolutionary safety secure sensorsafe

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.

Innovative One-Hand 360° Rotatable seat

Alllows parents to easily get their child in and out of the car seat.

EasyLock™ Bar

Reduces the force needed up to 4x for a quick, simple, and secure installation.

Adjustable Load Leg

Stabilizes the car seat and can reduce rotation in certain crashes by up to 30%*.


*As compared to the same car seat without this feature

One-Time Vehicle Belt Installation

The Sirona S with SensorSafe is the only convertible car seat in North America featuring a one-time vehicle belt installation for both rear-facing and forward-facing mode.

Product Specs

Available Colors

Indigo Blue, Manhattan Grey, Premium Black, Urban Black

Product Weight 30.4 lbs
Product Dimensions 25.3 x 20 x 25.5
Sirona S

Additional Info

Child Age (min) Newborn
Child Age (max) 8
Child weight (min) 4 lbs (22 lbs - forward facing)
Child Weight (max) 65 lbs (50 lbs - rear facing)
Length of Load Leg 10"-22"
SensorSafe™ Yes
Length of Load Leg 10-22"
Recline Positions 11
Headrest Positions 12
Cupholder Dimensions 5 x 3.5 x 4
Use and Care Machine Wash Cold, Line Dry
Warranty 2 years
Expiration (Years) 10 yrs after date of manufacture
Batteries Required Yes
Number of Batteries 1
Battery Cell Type CR2032 Lithium Coin Cell