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Description
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.
Sirona S is the first Convertible Car Seat in the U.S. to feature an innovative 360° rotatable seat with a load leg, making switching between rear-facing and forward-facing positions quick and easy. 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.

360º One-Hand Rotation
To easily get your child in and out
Stabilizes seat and can reduce rotation in certain crashes
For both rear-facing and forward-facing mode
REAR-FACING WITH SEAT BELT
FORWARD-FACING WITH SEAT BELT & TETHER
REAR-FACING WITH LOWER ANCHORS
FORWARD-FACING WITH LOWER ANCHORS & TETHER
Functions
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INNOVATIVE ONE-HAND 360° ROTATABLE SEAT Allows parents to easily get their child in and out of the car seat. |
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LOAD LEG TECHNOLOGY Load leg stabilizes the car seat and can reduce rotation in certain crashes by up to 30%. |
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ANTI-REBOUND DESIGN Reduces car seat rebound movement |
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12-POSITION RECLINE ADJUSTMENT On the Go Recline, allows adjustment of up to 12 different positions even when the child is in the seat. |
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EASYLOCK™ BAR & ONE TIME VEHICLE BELT INSTALLATION EasyLock™ Bar reduces force needed up to 4x for quick, simple and secure installation. Only Convertible Car Seat in North America with a one-time vehicle belt installation for both rear-facing and forward-facing mode |
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Smart-tech harness chest clip with SensorSafe™ technology provides alerts when unsafe situations arise including if a child unbuckles themselves while the vehicle is in motion; 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 after the vehicle has been switched off. These alerts are provided through an installed vehicle receiver and a user-friendly smartphone SensorSafe App. |
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LINEAR SIDE-IMPACT PROTECTION Absorbs up to 25% more impact forces in a collision* |
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MAGNETIC BUCKLE HOLDERS For easy entry and exit from the seat |
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CUP HOLDER Dishwasher safe and can be positioned on either side |
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12-POSITION, HEIGHT-ADJUSTABLE HEADREST With no-rethread harness |
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Sirona S FAQs
Will this car seat fit my child?
The Sirona S is designed for children between 4-65 lbs. (1.8-29.5 kg) with a height between 17”-49” (43.1-124.4 cm). Children weighing more than 65 lbs or more than 49” should consider a booster seat that accommodates their weight, height and age.
Will the Sirona S fit my vehicle?
The Sirona S has been fit tested in a variety of vehicles. Due to variations in make, models, and years of manufactured vehicles, however, you are encouraged to try the seat in your vehicle at a retail location nearest you. You should try both rear facing and forward facing modes and in different locations (outboard rear seat, vs middle seat).
Where can I check to make sure my car seat is installed properly?
Cybex recommends getting your seat installation checked by a Certified Child Passenger Safety Technician. You can find this free service by visiting www.safekids.org to find a seat check nearest you.
Does the Sirona S have an expiration?
You can find the date of manufacture and expiration date on a sticker located on the bottom of your Sirona S. Every car seat has an expiration due largely to allow you the benefit of regulatory changes and technology enhancements in child passenger safety. The Sirona S has been certified for 10 years from the date of manufacture. Once your car seat has reached its expiration date, we recommend recycling the seat by contacting your local community recycling center
How much does the Sirona S weigh?
The weight of the car seat (excluding the infant positioning pillow is 30.4 lbs. (13.8 kg.)
How big is the Sirona S?
The range of dimensions of the Sirona S are as follows:
Rear-Facing upright position: 23”H x 21.5” W x 30” D
Forward-Facing upright position: 31”H x 19”W x 28.5”D
Useful Life: 7 years
What fashions are available for the Sirona S?
The Sirona S is available in Black, Premium Black, Manhattan Grey, and Indigo Blue.






























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