The comfort fix isofix base is compatible with the hauck comfort fix car seat the isofix base can then be used as a practical addition to the following hauck pushchair sets atlantic plus trio set king air plus trio set maxan 3 plus trio set maxan 4 plus trio set rapid 3 plus trio set rapid 4 plus trio set and soul plus trio setthe isofix base can be secured into vehicles that have an isofix connection it is easy to assemble in the vehicle with just a few manoeuvres simply twist out the