Sizing Information: Evora Nasal Cushions are available in four sizes: Small, Medium, Large & Wide. All Evora masks use a single headgear size so any nasal cushion size can be used on any mask. If you would like to change the size of your Evora mask, you can just purchase a different cushion size and connect it to your existing headgear. To determine the size of your current cushion, check the side of the cushion for the embossed letters S, M, L or W.