The Baby Jogger Summit X3 Car Seat Adaptor is the easiest way to turn your stroller into a customised travel system. Attaching your car seat to a Baby Jogger stroller is extremely easy, and you can even fold the stroller with the adapter attached to give you a hugely versatile travel system. Features Compatible with Cybex, Maxi Cosi and Nuna Connect to your car seat and go Compatible with Summit X3