The replacement Full Face Cushion for the Mirage Quattro FX come as a single cushion in your desired size: small, medium, or large. All three sizes fit on the ResMed Mirage Quattro FX, but aren't a match for the original ResMed Mirage Quattro.
The dual-walls consists of an inner, supportive layer that stabilizes the cushion and a softer, outer membrane that reduces the likelihood of leaks and pressure sores. As air flows through the cushion, the outer membrane rolls and inflates around the nose rather than stretching over it.
Where do I find the size?
The size of the full face cushion is located on the flat bottom of the cushion. Turn the mask upside down with the headgear facing away from the user. Located on the bottom silicone flap to the right side of the name of the mask, an embossed clear letter will specify the size of the full face cushion. The letter is larger than the word ResMed and Quattro™ FX.
Quattro and Quattro FX mask frames, cushion clips and cushions are NOT interchangeable. Individual cushions are NOT interchangeable within each mask. The size must correspond for the mask to work properly. For more information visit the Mirage Quattro FX Full Face Mask Cushion and Clip.
The Quattro FX for Her comes in two sizes only: Small and Medium. It is not offered in a size Large.