Sirona S

Sirona S
Safety meets comfort with the Sirona S rear-facing car seat. It provides up to 50% better protection compared to a forward-facing position¹, Linear Side-impact Protection, and one-hand 360° rotation for easy boarding. Read more
  • Height 61 cm - 105 cm
  • Weight max. 20 kg
  • Regulation UN R129/04
  • 61 - 105 cm
  • 76 - 105 cm
Sirona S
Safety meets comfort with the Sirona S rear-facing car seat. It provides up to 50% better protection compared to a forward-facing position¹, Linear Side-impact Protection, and one-hand 360° rotation for easy boarding. Read more
  • Height 61 cm - 105 cm
  • Weight max. 20 kg
  • Regulation UN R129/04
  • 61 - 105 cm
  • 76 - 105 cm
Expected to be available from 04.11.2026
389,95 €
incl. VAT, free shipping
incl. VAT, free shipping

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Product Guarantees
EU guarantee label 1

Product Details:

Specification:

  • Age range: From approx. 3 months up to 4.5 years (From birth with newborn inlay as an accessory)
  • Child height: 61 – 105 cm
  • Child weight: 20 Kg
  • Approval regulation: UN R129/04

Safety Starts Rear-facing

Keep your child safe and comfortable with the Sirona S rear-facing car seat. Designed for rear-facing travel for up to four and a half years, it provides up to 50% better protection¹ compared to a forward-facing position. An energy‑absorbing shell and Linear Side‑impact Protection deliver 25% more safety in the event of a side collision². One-handed 360° rotation, an Easy In crotch pad and magnetic belt holders make on or off-boarding simple. Style models also feature an XXL sun canopy and a stylish Platinum design language.

Care Instructions:

  • Fabric covers machine washable at 30° C

Compatible with:

  • Base S
  • SensorSafe Toddler Safety Kit
  • Cup Holder
  • Sirona S Line Summer Cover
  • Sirona S-Line Newborn Inlay
  • ISOFIX Guides
  • Platinum Winter Footmuff Mini
  • Snogga Mini 2

AGR (Aktion Gesunder Rücken e.V)

The German AGR is an independent organization that evaluates products for their ability to relieve and avoid back-pain, one of the most common health issues worldwide today. CYBEX has been awarded their much vaunted Seal of Approval for the Sirona S, recognizing its unique ergonomic design and functionality.


References:

¹ Compared to the same seat in a forward-facing position during a frontal impact. Based on internal test results.

² Compared to the same seat without an L.S.P., based on internal testing.

³ Please Note: Mesh window is not UPF50+.

Product Code

526002917 (Misty Grey (Style))

Up to 50% Higher Safety Levels¹
Rear-facing car seat

Rear-facing travel is mandatory for the first 15 months and recommended for longer. With the Sirona S, you can keep your little one safely rear-facing for the first 4.5 years, providing up to 50% better protection than forward-facing travel in a conventional car seat¹. The car seat shell acts like a protective shield, distributing impact forces and holding your child close.

Made to Grow up to 4.5 Years Old
CYBEX GrowTech with multiple height and recline positions

Adapt the Sirona S as your child grows. Use it from birth with a separately available newborn inlay, while a removable comfort inlay supports larger babies. AGR-certified for enhanced ergonomics, the Sirona S features an adjustable headrest and 40% more recline range in both rear-facing and forward-facing positions. The seat structure enables the hip-healthy M-position for your child.

Easy Side Entry
Fast on and off-boarding thanks to 360° rotation

Smooth one-handed 360° rotation eases the strain on your back when getting your child in or out of the car. The Easy In crotch pad stays up and out of the way for gentle, stress-free seating.

 

Check your Car Compatibility
To confirm whether this car seat is suitable for installation in your vehicle, please use our Car Compatibility Checker.

Base S  


The Sirona S clicks on and off the Base S. This is installed using a load leg and ISOFIX. The Base S ensures safety and stability, and it can also be used with the infant car seat Cloud S and Anoris S Airbag. Look for the i-Size logo in your vehicle to check compatibility. If there is no i-Size logo but your car has ISOFIX, please check our Car Compatibility tool.
 

Measurements

Length
560 mm
Width
450 mm
Height
550 mm
Weight
7.8 kg (Style Model) / 7.5 kg (Comfort Model)

What is included?

What's included?

  • Sirona S Toddler Car seat
  • Comfort Inlay
  • User guide (Quick-start guide & digital guide access)
  • Sun canopy (included with Style Models only)

Find all available downloads for this product in the Download Center.

Before purchase

Will the car seat fit in my vehicle?

It is important to check whether the car seat is compatible with your vehicle before you purchase it. The car seat is approved for use in i-Size compatible vehicle seating positions as indicated by vehicle manufacturers in their vehicle User Guides. If your vehicle does not have an i-Size seating position, please check the Car Compatibility List. To access the Car Compatibility List, follow the relevant weblink in the Quick Start Guide, printed on the packaging box or find it on the product page of the CYBEX website. If vehicle is not listed, please contact our customer service for further assistance.

General

Can I use this car seat on a flight?

No, this car seat is not approved for use on an airplane.

Is it ok to keep using a car seat after an accident?

We at CYBEX strongly recommend that you replace a car seat after any kind of accident. This is because tiny hairline cracks, which may not be visible to the naked eye, can appear in the plastic parts of a car seat after an accident. These cracks can pose an increased risk to safety.

My car seat is faulty, how can I get it repaired?

Please refer to the retailer where you bought your CYBEX car seat. They will deal with the matter on your behalf.

Where can I get replacement parts for my product?

You can order replacement parts from a specialist retailer near you. To find a store near you, simply go to the Store Locator on the CYBEX Website.

How do I correctly secure my child in the seat?

Please observe the instructions in the User Guide. Adjust the child car seat to the size of your child and make sure that he or she is properly strapped in to ensure maximum safety.

My child keeps trying to wriggle out of the harness system. What can I do about this?

As with any other restraint system, a car seat can only fully protect your child if he or she is secured correctly and does not actively try to leave the car seat. Please explain to your child the importance of staying in the car seat before you travel. Common issues include the opening of belt buckles or the pulling down of shoulder belts on car seats secured by a harness. Make sure that the belts are fitting nice and snug, you should also consider what clothes your child is wearing while sat in the car seat, as thick clothing reduces the protection offered by the belt. You can keep your child safer by purchasing the SensorSafe chest clip accessory. It helps prevent the child from slipping out of the harness and if your child manages to open the clip, you will be instantly alerted via push notification on your smartphone. Please refer to the User Guide for further instructions and information.

How can I clean my car seat?

Car seats can be cleaned using a vacuum cleaner or damp cloth. Sand or other dirt beneath the cover can also be removed in this way. To clean the plastic parts of the car seat wipe them with a cloth using a mild detergent and warm water. (Warning: Please do not use chemical detergents or bleaching agents under any circumstances.) Please note that a car seat should never be dismantled for cleaning. Please always refer to your car seat’s User Guide when carrying out care and maintenance on your car seat. Generally the seat covers are machine washable at a maximum temperature of 30˚C on a delicate cycle. If you wash them at a higher temperature, the cover fabric might lose its color or shrink. Please wash the cover separately and never dry it by machine or in direct sunlight. (Warning: Only the cover of the car seat can be machine washed. The car seat itself is not machine washable.) Should you wish to clean a car seat more thoroughly than recommended above, you will have to have it cleaned professionally. Please ask the retailer who sold you the car seat to refer you to a professional service.

Installation and Securing your child

Can I install a rear-facing seat on the front passenger seat?

Rear-facing car seats must only be installed on the passenger seat if the front airbag has been deactivated. Placing your child on a passenger seat with an activated airbag poses an enormous risk of injury, and we at CYBEX strictly advise against this. For other types of car seats check the user manuals of both your car seat and your vehicle to find out if you should deactivate the airbag. Statistics show that the safest place for a car seat is on the rear seat behind the front passenger seat. Side airbags do not put your child’s safety at risk. If you have no choice other than to use the front passenger seat, please ensure that the seat is pushed back as far as possible and that the airbag is deactivated.

Can I use the car seat on laterally-facing vehicle seats?

It is not permitted to use the car seat on laterally-facing vehicle seats.

Can I use the car seat on rear-facing vehicle benches (e.g. in vans or minibuses)?

No. This car seat cannot be used on rear-facing vehicle benches.

Can I also use this seat in a car without ISOFIX anchorage points?

No, this seat can only be installed in vehicles with ISOFIX anchorage points, due to the fact that it must be installed with ISOFIX in every position.

Where should I install a car seat in my car?

Although it may be possible to install a CYBEX car seat on other seats in the vehicle, the safest place for a car seat is in the rear seat, behind the front passenger seat. We advise you to refer to the Car Compatibility Tool on the CYBEX Website. You can scan the dedicated QR-Code on your Quick Start Guide or use the specific weblink, provided on the Packaging Box, to access the Car Compatibility Tool for your product.

Safe Travel

Can I use the car seat even when the side airbag is activated?

Yes, the side airbag can remain activated when using the car seat.

Usage

What kind of clothing should my child wear when seated in the car seat?

Thick clothing prevents the harness/vehicle belt or impact shield from lying tight against the body of the child. Only a correctly adjusted restraint system can offer maximum protection. For this reason, your child should wear everyday clothing. Thick clothing such as winter jackets and clothing with hoods (e.g. hoodies) as well as hats should be avoided where possible. Once your child has been positioned in the car seat, he/she can be covered with an extra blanket for warmth.

What is the maximum diameter of a bottle to still fit in the cup holder?

The diameter of a bottle should not be larger than 7 cm.

Warranty Claims


If you need to claim your warranty, please contact the original retailer where you purchased your CYBEX product.


If you purchased your product directly from the CYBEX Online Shop, please use our Contact Form to get in touch with us.



Spare Parts (outside Warranty)


If you are looking for spare parts and your product is no longer under warranty, please contact any authorized CYBEX retailer in your area. You can find one using our Store Locator.


Not sure if you're still under warranty? In that case, feel free to contact us – we're happy to help.