This is the replacement cushion for the Philips Respironics DreamWear Full Face CPAP Mask. Four cushion sizes: Small, Medium, MediumWide & Large are available. The DreamWear mask's full face cushion rests under the nose, providing airflow to both the mouth and nose without actually inserting into the nostrils or exerting any excess pressure. Because of the cushion's low profile design there is absolutely no contact on the top of the nose or at the sensitive nasal bridge. Exhalation ports on the cushion, and in the mask's elbow, quietly disperse excess air.