Cybex Sirona S2 i-Size

Our score 9.73 / 10

Research by Peter Crona Last updated Method How we research

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From 61 cm, up to 105 cm (~3 months to 4 years).

Cybex Sirona S2 i-Size

Pros

  • Rotation and 61-105 cm toddler focus make loading easier without pretending to cover booster years.

Cons

  • It stops at 105 cm, so a later high-back booster or next-stage seat is part of the plan.
Rotation
Yes
Seat Use
Toddler
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The CYBEX Sirona S2 i-Size is for the stage after an infant carrier, when parents want easier loading and the option to keep a child rear-facing within the seat’s 61-105 cm range. The integrated base and rotation reduce twisting during daily buckling, but they also make this a fixed main-car seat rather than a light transfer option. Installation, support leg placement, recline, and harness height must follow the vehicle list and current manual. Forward-facing eligibility is not a reason to switch early; use the approved rear-facing mode as long as the child still fits. This seat ends at 105 cm, so budget and plan for a later high-back booster.