Intuitive design The secret behind this mask's comfortable, high-performing seal is its UltraCompact cushion design, which is curved to fit comfortably and securely around the nose. No matter the sleep position, AirFit F30i is designed to stay in place with minimal facial contact – no additional forehead support needed. It also features a quick-release elbow, which makes it easy to disconnect mask from the tubing without the mask parts getting stuck or lost.