Base for primo viaggio 4.35 features the right tight system which easily and securely locks the base in place for added stability. An infinite recline knob and an easy to use tri-zone level indicator allow to easily find the proper seat angle pertinent to child 's growth stage. Color coded belt paths help in routing vehicle seat belts. An integrated anti rebound bar offers superior protection in case of a collision. Modern design with rounded shape bottom allows for a better fit and is gentle on all vehicles upholstery.