You've discovered the versatility of the Mutsy 4 Rider, but you still love the popular and comfortable infant carrier and car seat that you already own, so add this Maxi Cosi adaptor to your purchase to easily integrate both into a single, simple solution. It's easy to attach to the 4 Rider frame and designed for secure and worry-free use, letting you transfer your baby effortlessly from the car to the stroller and back again.