The Cybex Universal Infant Car Seat Adapter converts any Cybex stroller into a travel system. The adapter will work with most infant car seats on the market today. This easy to use system attaches to the frame of the Cybex Ruby, Onyx, Topaz, or Callisto (all models 2009- up) to secure infant car seats like the Graco Snug Ride, Chicco Key Fit and many others. Now you have the option of taking a lightweight Cybex umbrella stroller and turning it into a travel system! The adapter will fold while on the stroller, and when not in use can be easily stored in the basket. It's small enough to even fit in a diaper bag or purse.