Chicco Unico Evo I-size Car SeatWHAT IS THE I SIZE CAR SEAT? The ECE R129 car seat regulation classifies seats based on the height of the child, thus facilitating the choice. Allows you to travel with the seat rearward facing for up to 15 months to protect the childs head and neck. It is approved by passing strict side impact tests to ensure greater safety. It is always compatible with i Size approved cars. LONG LASTING CAR SEAT! Unico Evo i Size accompanies the child from birth up