Egg2® Shell Car Seat Isofix Base This Isofix Base has been specially made to connect the egg® Shell Car Seat (sold separately) inside your vehicle equipped with Isofix points. It features extendable support leg, which guarantees complete stability of the attached seat. A rebound bar prevents the seat from moving backwards in the case of the front impact. Visual indicators will make sure that the seat is properly installed onto the base. Compatible With: Egg shell Infant Car Seat i-Size (sold separately). Features: Suitable to use with egg® Shell Car Seat Isofix connection points Extendable support leg Rebound bar. Visual indicators for safe and hassle-free installation.