The Baby Jogger City Sights Maxi-Cosi, Cybex, or BeSafe Adapter is one simple accessory that quickly and easily transforms your stroller into a travel system for you and little ones car seat. You can simply attach the adapter which connects your Maxi-Cosi, BeSafe, or Cybex infant car seat onto the stroller – perfect for those busy days when you need to get from point A to point B with ease.