ONLY COMPATIBLE WITH: Fits UPPAbaby Aria or Mesa Max Infant Car Seats. Not compatible with Mesa and Mesa V2 models. Infant carrier not included. EXTRA BASE: An extra infant car seat base allows you flexibility and ease of travel. Ideal for multiple family vehicles – no more swapping car seat bases between relatives, babysitters, or spouses! INSTALL IN SECONDS: We make installation quick and simple for you by combining our SmartSecure system, auto-retracting LATCH design, bubble level indicators, red to green visual indicators, plus four-position adjustable foot. INCLUDED LOAD LEG: The adjustable load leg adds stability and increases overall safety through limiting forward rotation during a front collision to reduce the chance of a head or neck injury. ANTI-REBOUND+ PANEL: The anti-rebound+ panel provides increased safety and protection by limiting the rotation and movement of the car seat in the event of a rear-impact collision. SEAT BELT INSTALLATION: Built-in lock-off for secure seat belt installation. FINISHED BOTTOM: The smooth, finished base bottom won’t damage car interiors. COMPLIMENTARY CONSULATIONS: Schedule a one-on-one virtual consultation with a Certified Technician from the UPPAbaby website for product support, car seat checks, or service appointments.