Features : -Allows you to turn your Baby Jogger City Mini, City Mini GT, Summit X3 or City Elite stroller into a travel system -Provides a place to securely attach your car seat to the stroller until your baby can sit in the upright seat -Stroller can be folded with the adapter attached -Must be installed without the sunshade -Adapt the following car seats : KeyFit / KeyFit 30 car seats from Chicco, Primo Viaggio SIP / Primo Viaggio 4-35 car seats from Peg Perego