The UPPAbaby Mesa car seat base installs in a car using a very unique self-retracting LATCH system called Smart Secure. Simply click in the LATCH connectors, and push down hard. The retractors work like a charm, and theres an indicator window that goes from green to red when the seat is snug. This tension indicator measures pressure on the bottom of the base, so it works for seatbelt installations in addition to LATCH. For seat belt installations, there are also built-in lockoffs. The base itself is a low-profile, slim design that gives parents a clear sightline to be sure the car seat is docked properly, and fits even contoured vehicle seats nicely. Theres an adjustable level, and an easy-to-read level indicator on both sides of the seat. The bottom of the base is completely finished, eliminating the need for a seat protector under the car seat (a CPST no-no). Safety Without Complexity MESA combines the safety, functionality, and ease of use parents and babies need to feel protected and reassured. The MESA is the only infant car seat on the market that uses SMARTSECURE System. This unique technology utilizes a tightness indicator and self-retracting mini LATCH connectors to facilitate quick, accurate, and easy installation. With a keen eye for designing stylish and sleek products that combine features and functions new parents wantplus innovations they never knew were possible, the MESA works directly with the VISTA smart luxury stroller and the CRUZ stroller systems without the purchase of adapters. Additional MESA features include: dual door lock-off design accommodates even more seat belt webbing styles SIP Side Impact Protection integrated with a no-rethread harness that enables front adjustment access to facilitate easy and accurate harness position optimized for preemies. Convenience A one-push stroller release on the carry handle makes stroller-to-car transfer smooth and easy. Protection A hideaway SPF 50+ canopy protects infants from the sun, but when not in use hides away. The MESA also has integrated storage pockets for the infant restraint buckles to keep the metal parts cool when the seat is exposed to sun and within easy-reach for child restraint. The MESA has an extremely low profile and slim base with a finished bottom to protect car upholstery and eliminates the need for seat protectors, which can compromise car seat installation and safety. The MESA comes in four fashions: DREW (tangerine), SEBBY (teal), LINDSEY (wheat), and JAKE (black)