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 set the isofix base can be secured into vehicles that have an isofix connection it is easy to assemble in the vehicle with just a few man oeuvres simply twist out t