It addresses, among other things, the securing of child seats with Isofix as well as the rear-facing transport of children. Traffic physicians, accident researchers, and consumer and health organizations recommend transporting children in rear-facing child seats even beyond group 0+. In the Cybex Sirona M2, children can be safely transported rear-facing up to a height of 105 cm. Thanks to its intelligent design, even taller children have enough legroom to sit comfortably. At the same time, the seat can be easily installed in small cars. Practical features such as the one-handed seat and recline adjustment make daily use easier. Important: The Sirona M2 i-Size can only be used in combination with the Base M and cannot be installed in the vehicle on its own. The Cybex Isofix Base M must be purchased separately and is not included in the delivery.