Sizing Information: All Ultra Mirage & Ultra Mirage II Nasal Masks use the same frame size so any size cushion can be used with any mask. (i.e. If you are currently using the mask with a Standard cushion and feel that a Large may be preferred you can just purchase the Large cushion and install it on your current mask frame.) 

Shallow cushions are designed for people with flatter nasal bridges or faces. Wide cushions are designed for patients with wider noses. These Cushions will NOT work with Ultra Mirage Full Face masks.