UPPAbaby Upper Adapter STROLLER COMPATIBILITY: UPPAbaby Vista (models 2015-2019), Vista V2, and Vista V3 strollers. TO BE USED WITH: Toddler Seat (comes with Vista), Bassinet, Aria, Mesa/Mesa V2, Mesa Max Infant Car Seats. NOT compatible with RumbleSeat accessory. Please see the pictures for more details. Never used!