The Joey instantly adds room to your existing Valco Baby stroller and lets your toddler relax on long walks that tire out little legs. Its high back provides support and adds comfort. For extra convenience, it is designed to fold compactly to the side when not in use, and can even remain in place while stroller is folded. Note: Single Joey is compatible with the Valco Baby Tri Mode EX, Matrix, and Quad Strollers.