This is the replacement cushion for the Philips Respironics DreamWear Full Face CPAP Mask. Four cushion sizes: Small, Medium, MediumWide & Large are available.Small #1133430Medium #1133431MediumWide #1133433 Large #1133432 The DreamWear masks 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 cushions 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 masks elbow, quietly disperse excess air.Open field of vision:Wear glasses, read, and watch TV. No red marks: Leaves no marks on the bridge of the nose Innovative: Under-the-nose design To determine your current cushions size, look for an abbreviation (S, M, MW or L) on the side of the cushion. Any cushion size will fit on any DreamWear Full Face Mask.If you are upgrading from the nasal DreamWear to the Full Face, you will also need the Full Face Headgear.