Cybex Sirona T i-size 45-105cm car seat, Plus Mirage Grey

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  • € 409.00
Client price: € 388.55 (- 5 %)
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Sirona T i-Size 45-105cm car seat


From birth up to 4 years

Safety for the child, comfort for the parent. The Sirona T i-Size rear-facing car seat features all-round air ventilation and smooth 360° rotation. The Plus line also has an integrated sun canopy.


Travelling in Safety & Comfort ‒ Rear & forward-facing

Enjoy the ultimate travel experience with the CYBEX Sirona T i-Size rear-facing car seat. Your child can enjoy the hight of comfort with features like all-round air ventilation promising pleasant temperatures in all seasons. Smooth 360° Rotation lets you get them on and off-board effortlessly, and helps you switch between rear or forward-facing travel. Recline the seat with one hand, for extra comfort on the road. And you can enjoy peace of mind through safety features such as integrated Linear Side-impact Protection. Get ready for blissful trips with your child, with the Sirona T i-Size.




Up to 50% higher safety

The Sirona T i-Size is a rear-facing car seat providing superior accident protection, reducing the risk of head or neck injury and improving safety by 50% (compared with the same seat forward-facing; results of testing using 2022 ADAC criteria). In a crash, the child is pushed towards the seat shell, where forces are distributed and lose impact. Rear-facing is mandatory for at least 15 months (76 cm tall). After that you are able to rotate the Sirona T-Size forward-facing, although, we recommend rear-facing travel for up to four years if possible.


Optimal breathability

All-round air ventilation provides year-round comfort. And the Plus fabric version has even better airflow, with a 3D mesh that increases breathability up to six times (compared to conventional fabric). The Plus line also features a sun canopy with mesh inserts to keep your child cool and protected.


Easy on and off-boarding

Get your child in and out of the car with ease. 360° rotation lets you swivel the Sirona T i-Size smoothly towards the car door with one hand, for easy boarding and less back strain. Rear-facing is mandatory for at least the first 15 months (up to a height of 76 cm). Then you can keep your child rear-facing or turn them forwards for extra comfort.




Comfort throughout their journey

The Sirona T i-Size features five recline positions in both rear and forward-facing positions. It can also recline while rotating on its base. Reclining the seat requires only one hand, keeping your other hand free for different tasks.


25% more side-impact protection

A proven Linear Side-impact Protection (L.S.P.) System enhances safety in the event of a side crash. Together with the car seat’s energy-absorbing shell, the L.S.P. reduces initial impact force by up to 25% (compared to the same seat without L.S.P. using ADAC test criteria). The L.S.P. System folds away if space in the car is limited.


Grows with your child

The Sirona T i-Size evolves with your child, thanks to a height-adjustable headrest designed to accomodate their rapid growth. 12 different headrest positions let you adapt the car seat to your childs size during their first four years, providing steady protection throughout this time.


Good fit for the youngest travelers

A newborn inlay provides a near-flat lying position, for safe travel from birth. The baby’s head is kept in the ideal ergonomic position, especially during sleep. When your baby grows taller than 60 cm, the newborn inlay should be removed.


Stress-free boarding

Magnets let you attatch the buckle tongues to the sides of the the Sirona T i-Size, keeping the belts out of the way as you get your child in or out of the car seat. Simplified onboarding for a stress-free experience.


Intuitive installation and anchorage

A secure base for the Sirona T i-Size. The Base T is equipped with ISOFIX and a load leg for quick and stable installation. User-friendly release buttons feature visual indicators helping you confirm the base is set up correctly. Set-up is as easy as it gets, helping ensure a safe and comfortable ride. Cybex Base T isofix is sold separately.*


Reliable UPF50+ protection

A UPF50+ sun canopy gives your child excellent sun protection, even in the car. For warmer days, the sun canopy is equipped with mesh inserts, for breathability and cool airflow (sun canopy included with Plus line only – mesh parts are not UPF50+).


What is included?

  • Sirona T i-Size toddler car seat
  • With PLUS version only: Sun canopy (included with plus line only)
  • Newborn Inlay
  • User guide



  • Age range: From birth up to 4 years
  • Child height: 45 - 105 cm
  • Child weight: Max. 18 kg
  • Approval regulation: UN R129/03
  • Dimensions: Length 715 mm, Width 430 mm, Height 680 mm
  • Weight 15 kg
  • Care instructions: Fabric covers machine washable at 30° C


Compatible with (sold separately):

  • Cybex Base T isofix
  • Cybex Base Z2 isofix
  • Cybex Car Seat Cup Holder (coming soon)
  • Cybex Sirona T Line Summer Cover (coming soon)
  • Cybex SensorSafe 4-in-1 Kit Toddler
  • Cybex ISOFIX Guides

Installation with base: Pay attention to the i-size logo. If a vehicle seat is marked with this logo, it is suitable for use with all i-size child seats and therefore will not appear in our list of compatible vehicles. If your vehicle does not have an i-Size seat, please check the compatibility of your vehicle. If your vehicle is not displayed, please contact our customer service team.

Model code: 36-523000393
Product code: 275309
Color: Mirage Grey

Transport information

The estimated delivery time depends on the transport method chosen by the customer. If the item is out of stock, please contact our customer service regarding availability!