Keep your child safe and comfortable with the Cybex Sirona S rear-facing car seat. Designed for rear-facing travel for up to four and a half years, it provides up to 50% better protection¹ compared to a forward-facing position. An energy‑absorbing shell and Linear Side‑impact Protection deliver 25% more safety in the event of a side collision². One-handed 360° rotation, an Easy In crotch pad and magnetic belt holders make on or off-boarding simple. Part of the S-Line modular system and compatible with the Base S.