The ResMed AirFit N30 Nasal Mask with Headgear features QuickFit elastic headgear that slips on like a pair of goggles and is made to fit right out of the package. There is a small headgear clip on the side to make minor adjustments if needed. The curved cushion of the AirFit N40 is small and very soft. It sits under your nose for a comfortable fit designed to prevent soreness in your nostrils. This fit pack includes 3 sizes of cushions to fit your needs.