The UPPAbaby Lower Infant Car Seat Adapters allow you to convert your Vista stroller into a versatile multi-seat system by adding a compatible infant car seat in the lower position. They feature large, color-coded hubs for quick, tool-free installation and securely attach to Vista models from 2015 onward. The adapters remain on the stroller during folding and include a secure latch for safety. They enable seamless transitions between infant and toddler configurations, expanding your strollers usability.