An extra MESA MAX 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! Load leg for increased safety & reduction in head/neck injury Anti-Rebound+ Panel for increased safety in rebound & rear-impact collisions SMARTSecure® System installs in seconds. Red-to-green tightness indicator Built-in lock off for secure seatbelt installation Bubble level indicators on both sides to aid in getting correct angle during installation Streamlined, low-profile base with finished bottom Four-position adjustable foot to accommodate various car seat angles