With time, your mask's cushion starts to lose its ability to seal due to accumulating grease and other flaws. These issues also pose certain hygiene concerns. Regularly replacing your cushion is key to effective sleep therapy. This replacement cushion is compatible with both the AirFit F10 and Quattro Air full face masks, as well as the For Her variants. Using dual-wall SpringAir technology, this cushion creates an effective, but comfortable, seal. The cushion's inner layer provides stability and the soft outer layer reduces the likelihood of leaks. While other cushions stretch as you breathe, the SpringAir cushion rolls and expands to prevent soreness and discomfort.