Cybex Sirona T i-Size Plus: 360° Safety & Comfort Travel safely from day one with the Sirona T i-Size Plus. This versatile car seat rotates 360° for effortless boarding and allows rear-facing travel—proven to be up to 50% safer—for children up to 4 years old (105 cm). Featuring all-round air ventilation for year-round comfort and integrated side-impact protection, it combines top-tier safety with everyday convenience. Includes one-hand recline for naps and machine-washable covers for easy care.