The Maxi-Cosi CabrioFix i-Size base makes installation of the baby car seat hassle-free. Install the Maxi-Cosi CabrioFix i-Size car seat base by attaching it to the ISOFIX connectors in your car. PERFECT MATCH: Made for the Maxi-Cosi CabrioFix i-Size baby car seat - Not compatible with the CabrioFix R44 version and CabrioFix S i-Size.