Cybex Sirona Si

The CYBEX Sirona Si is a 360° rotating i-Size toddler car seat from the new CYBEX S-Line with an integrated ISOFIX base, so it's ready to use straight from the box. Rear-facing travel gives up to 50% better protection than forward-facing, and the one-hand 360° rotation makes side entry simple. Made to grow with your child to around 4.5 years.

Why parents choose the Sirona Si

• Up to 50% better protection rear-facing – a padded energy-absorbing shell distributes impact forces and holds your child close, with rear-facing travel to approx. 4.5 years.
• Comes with the Base S – a ready-to-use setup straight from the box, with smooth one-hand 180° rotation for easy side entry.
• Grows up to 4.5 years – CYBEX GrowTech adapts with your child (40–105 cm with the newborn inlay accessory), AGR-certified with an adjustable headrest, M-position and 40% more recline range.
• Use from 3 months to 4.5 years – removable inlays tailor the fit as your child grows; the Comfort inlay (included) supports them to 85 cm.
• One-hand 360° rotation – turn the seat to the door and lift your child in or out without straining your back.
• Magnetic belt holders – keep the belts tucked neatly aside for a calm, effortless loading experience.
• 25% more side-impact protection – the Linear Side-Impact Protection (L.S.P.) system channels energy into the energy-absorbing shell and headrest.
• Optimal breathability – 3D mesh fabric boosts airflow up to 6× versus conventional materials; SensorSafe is available for added reassurance.

Approved to UN R129/04. Suitable from approx. 3 months to 4.5 years (61–105 cm, max. 20 kg; from birth with the newborn inlay accessory). Supplied with the Base S.