Cybex Sirona Gi i-Size Plus car seat Maximum comfort and safety for the first four years of life. The rear-facing Sirona Gi i-Size can be rotated 360° and ensures that you can easily place your child in the car seat. All-round air circulation for pleasantly cool journeys. The latest child seat in the successful Sirona line is the most comfortable yet: the Sirona Gi i-Size. This child seat is rear-facing and ensures safety from all directions with its integrated linear side impact protection. More comfort for your child: thanks to the 360° rotation of the child seat, you can easily put your child in and take them out again. All-round air circulation in the seat ensures cool car journeys - for more breathability, choose the Plus version of the Sirona Gi i-Size with additional mesh. 360° comfort and safety for the first few years of life, both for small newborns and full-grown four-year-olds: rely on customised comfort in both directions of travel - thanks to five reclining positions.