Baby Jogger City Select Stroller Second Seat Kit. This second seat kit turns your City Select stroller into a sleek double stroller in just seconds! And with a variety of accessory options, the City Select offers premium versatility to suit every family's comfort and needs. If you have any questions about this item, please give us a call (800)355-2956. We carry the entire line of Baby Jogger strollers and accessories for the City Select stroller.