Cybex Sirona T iSize
Cybex Sirona T iSize

















Introducing the Cybex Sirona T rotating car seat. The next stage up from the Cybex Cloud T / Z2 infant carrier. The Sirona T is compatible with the BASE T/ Base Z2 ISOFIX base which is great for parents. Enjoy a hassle-free transition once baby has outgrown the infant car seat!
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.
- iSize tested UN R129/03
- Rotating car seat (Base Sold Separately)
- Compatible with Cybex Base T and Base Z2 ISOFIX Bases
- Suitable rearward facing from birth to approx 4 years
- Suitable forward facing from at least 15 months old. (longer if possible)
The Cybex Sirona T i-Size is the perfect follow-on car seat once your little one has outgrown their infant carrier like the Cybex Cloud T or Z2. Designed to keep your child rearward-facing for as long as possible (which is the safest position), the Sirona T offers comfort, ventilation, and clever usability features for daily life. The 360° rotation makes strapping in your child a breeze – no awkward bending or twisting needed. If you’re already using the Base T or Base Z2, this seat clicks straight on – making the transition seamless and cost-effective.
It’s a great long-term investment, keeping your child safe and snug from birth up to approx. 4 years old.
What We Also Love..
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360° Rotation
The seat rotates a full 360 degrees when used with the Base T or Base Z2, letting you turn the seat toward the car door for easy access. This makes getting your child in and out of the car much easier – no more straining your back or awkwardly reaching around! -
Extended Rear-Facing Safety
The Sirona T allows your child to remain rearward-facing from birth up to approximately 4 years old. Rearward-facing travel is proven to be up to five times safer for young children in the event of a collision, especially for protecting their neck and spine. -
Superior Ventilation
All-round air circulation keeps your child cool and comfy year-round. The Plus fabric version steps this up with special 3D mesh panels that increase breathability by up to six times – perfect for long journeys or warmer weather. -
One-Handed Recline
Adjust the seat’s recline position with just one hand – ideal when your child dozes off mid-journey. It offers 5 reclining positions when rear-facing and 3 when forward-facing, so you can find the most comfortable position every time. -
Grows With Your Child
The 12-position height-adjustable headrest ensures the car seat adapts as your child grows. The harness automatically adjusts with it, so there’s no need for fiddly strap rethreading. It also comes with a soft newborn inlay for the early months, which can be removed once your baby is around 60cm tall. -
Side-Impact Protection
The integrated Linear Side-impact Protection (L.S.P.) system, combined with the energy-absorbing shell, reduces side-impact forces by up to 25%. This gives you peace of mind knowing your child is protected from every angle. -
Travel System Continuity
If you've already been using the Cybex Base T or Base Z2 with your infant carrier (like the Cloud T), there's no need to buy a new base. The Sirona T clicks right in, saving you both time and money as your child transitions to the next stage.
Key features of Cybex Sirona T iSize Car Seat
- 1 handed recline with 5 reclining positions when rear-facing and 3 reclining positions when forward facing
- Height-adjustable headrest offers 12 positions to grow with your child
- 360° rotation means less strain on parents backs & switching between rear- and forward-facing position easy
- Linear Side-impact Protection (L.S.P.) System offers increased safety & protection. Energy-absorbing shell also helps reduce the force of a side-impact
- 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.
- 5-point harness system, secure your child with ease
- Group 0+/1 car seat
- Suitable rearward facing from birth to approx 4 years
- Suitable forward facing from at least 15 months old. (longer if possible)
Product dimensions - L 71.5cm x W 43cm x H 68cm
Product weight - 15kg
Maintenance - Fabric covers machine washable at 30°
Nwborn inlay included.
Product usage - birth to 4 years
Tested - UN R129/03 i-Size
Base Compatible - Cybex Base T and Z2 (sold separately)
Overview
Introducing the Cybex Sirona T rotating car seat. The next stage up from the Cybex Cloud T / Z2 infant carrier. The Sirona T is compatible with the BASE T/ Base Z2 ISOFIX base which is great for parents. Enjoy a hassle-free transition once baby has outgrown the infant car seat!
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.
- iSize tested UN R129/03
- Rotating car seat (Base Sold Separately)
- Compatible with Cybex Base T and Base Z2 ISOFIX Bases
- Suitable rearward facing from birth to approx 4 years
- Suitable forward facing from at least 15 months old. (longer if possible)
Expert advice
The Cybex Sirona T i-Size is the perfect follow-on car seat once your little one has outgrown their infant carrier like the Cybex Cloud T or Z2. Designed to keep your child rearward-facing for as long as possible (which is the safest position), the Sirona T offers comfort, ventilation, and clever usability features for daily life. The 360° rotation makes strapping in your child a breeze – no awkward bending or twisting needed. If you’re already using the Base T or Base Z2, this seat clicks straight on – making the transition seamless and cost-effective.
It’s a great long-term investment, keeping your child safe and snug from birth up to approx. 4 years old.
What We Also Love..
-
360° Rotation
The seat rotates a full 360 degrees when used with the Base T or Base Z2, letting you turn the seat toward the car door for easy access. This makes getting your child in and out of the car much easier – no more straining your back or awkwardly reaching around! -
Extended Rear-Facing Safety
The Sirona T allows your child to remain rearward-facing from birth up to approximately 4 years old. Rearward-facing travel is proven to be up to five times safer for young children in the event of a collision, especially for protecting their neck and spine. -
Superior Ventilation
All-round air circulation keeps your child cool and comfy year-round. The Plus fabric version steps this up with special 3D mesh panels that increase breathability by up to six times – perfect for long journeys or warmer weather. -
One-Handed Recline
Adjust the seat’s recline position with just one hand – ideal when your child dozes off mid-journey. It offers 5 reclining positions when rear-facing and 3 when forward-facing, so you can find the most comfortable position every time. -
Grows With Your Child
The 12-position height-adjustable headrest ensures the car seat adapts as your child grows. The harness automatically adjusts with it, so there’s no need for fiddly strap rethreading. It also comes with a soft newborn inlay for the early months, which can be removed once your baby is around 60cm tall. -
Side-Impact Protection
The integrated Linear Side-impact Protection (L.S.P.) system, combined with the energy-absorbing shell, reduces side-impact forces by up to 25%. This gives you peace of mind knowing your child is protected from every angle. -
Travel System Continuity
If you've already been using the Cybex Base T or Base Z2 with your infant carrier (like the Cloud T), there's no need to buy a new base. The Sirona T clicks right in, saving you both time and money as your child transitions to the next stage.
Key features & safety
Key features of Cybex Sirona T iSize Car Seat
- 1 handed recline with 5 reclining positions when rear-facing and 3 reclining positions when forward facing
- Height-adjustable headrest offers 12 positions to grow with your child
- 360° rotation means less strain on parents backs & switching between rear- and forward-facing position easy
- Linear Side-impact Protection (L.S.P.) System offers increased safety & protection. Energy-absorbing shell also helps reduce the force of a side-impact
- 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.
- 5-point harness system, secure your child with ease
- Group 0+/1 car seat
- Suitable rearward facing from birth to approx 4 years
- Suitable forward facing from at least 15 months old. (longer if possible)
Specifications
Product dimensions - L 71.5cm x W 43cm x H 68cm
Product weight - 15kg
Maintenance - Fabric covers machine washable at 30°
Nwborn inlay included.
Product usage - birth to 4 years
Tested - UN R129/03 i-Size
Base Compatible - Cybex Base T and Z2 (sold separately)
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