The City Select Double Stroller by Baby Jogger is a one-of-a-kind, multi-functional stroller that allows parents to mix and match seats, bassinets, and car seats to customize their stroller. The City Select starts with a single capacity stroller but expands to a double by using a unique patented attachment method which is included. As your family grows, simply snap on a second seat and you're ready to take on the town in stylish convenience. And with Baby Jogger's famous Quick-Fold Technology this stroller's convenience is doubled by making it the only in-line stroller to fold flat in one simple step. The City Select presents 16 unique seating combinations from double tiered car seats to a bassinet and single seat combo. And with a variety of accessory options, the City Select offers premium versatility to suit every family's comfort and needs. Whether you've just had a second child and need to add a seat, or your older child has outgrown his stroller days and you no longer need a second seat, the City Select Double Stroller converts easily to work with your changing needs as a parent. With the best double stroller on the market, all you have left to do is convince your kindergartner to stay on his feet!