The AirFit F30i features an UltraCompact cushion designed to seal securely at the bottom of the nose to prevent nasal bridge discomfort and red marks. These replacement UltraCompact Full Face Cushions are designed for use with all AirFit F30i CPAP & BiLevel Masks. ResMed's UltraCompact F30i Full Face Cushions feature an innovative, minimal contact design that sits below the nose -- covering just the mouth and the nostrils -- to reduce contact with the face and eliminate problematic touch-points like the nasal bridge and upper cheeks. The low profile design helps reduce the pinching and red marks common to many full face mask designs; but it's also perfect for people who wear glasses or like to read at night.