The two main pieces of your dream travel system are unlikely to come from the same brand: after all, different strollers and different car seats have a wild array of merits that best suit a variety of families and lifestyles. So it's likely that in order to enjoy the click-and-go functionality of an infant travel system, which permits you to transfer your baby from car to stroller and back again without undoing a single harness buckle, you're going to need a car seat adapter. With the Baby Jogger Car Seat Adapter for the UPPAbaby MESA / City Select, you can enjoy the merits of the terrifically easy-to-use MESA car seat and the ultra-versatile City Select or Versa all together. It's easy to install your car seat adapter, and you can continue using it until your baby is ready to sit in an upright stroller seat. Use with the Baby Jogger City Select and Baby City Versa Strollers only; for the Baby Jogger City Mini and other models, use adapter model BJ90124.