Size Information: Ultra Soft Full Face Cushions come in three sizes -- Small, Medium & Large. All AirTouch F20, AirTouch F20 For Her, AirFit F20, and AirFit F20 For Her Masks use a single frame size so any UltraSoft or InfinitySeal Full Face cushion can be used with any F20 series mask frame. If you would like to change the size or style of your mask, you can just purchase a different F20 cushion and attach it to your existing mask frame.