Size:Large The AirTouch Full Face cushion is interchangeable with the AirFit F20, and the AirFit F20 for Her Full Face CPAP Mask. Available in Small, Medium and Large. All size cushions fit the F20 frame which is universal to all F20 cushions. The plush memory foam cushion is designed to conform to the unique contours of each individual face, creating a light, soft, breathable seal that stays in place throughout the night.