Add this 2.0 2nd seat to your Mockingbird Single to Double Stroller (both the original and 2.0 versions) to turn it into a double! The new 2.0 version has 1 pull adjustment straps, no rethreading needed. Includes second seat, upper adapters, and lower adapters for multiple configurations, as well as an extendable canopy that features extra protection for your little one with UPF 50 protection, a magnetic peekaboo window, and mesh section for air flow. This is not compatible with the Single Stroller.