The Car Seat Adapter is the easiest way to turn your stroller into a customized travel system. Attaching your car seat to a Baby Jogger stroller has never been easier. You can even fold the stroller with the brackets attached, giving you the most versatile travel system available.
Compatible with: F.I.T.® jogger, summit™ X3, city mini™ GT, city mini™, city elite®, city mini™ 4-wheel
To check car seat compatibility, refer here: http://www.babyjogger.com/uploads/2014-CSA-Guide.pdf