The ResMed Mirage Quattro without the headgear is the ResMed Quattro Full Face mask WITHOUTthe headgear. Full Face CPAP Mask features several areas of adjustment to provide the most comfortable fit and seal possible. A full face mask is a great solution for those with frequent nasal congestion and can be useful to have on hand in the event of a cold or bothersome allergies. This is a full face mask that covers the entire nose and mouth.