Sizing Information: Cradle Nasal Cushions come in three sizes -- Small, Medium and SmallWide -- any of which can be used on any AirFit N30 Nasal Mask. If you would like to try a different N30 cushion size, simply purchase the cushion you prefer and install it on your existing mask frame. AirFit N30 Cushion sizes are indicated by color: a red cushion for Small, a blue cushion Medium or a purple cushion for SmallWide.