This is a replacement cushion for only two ResMed FULL FACE masks: Ultra Mirage Full FaceMirage Series 2 Full Face About Cushion Sizes: Both the frame and cushion of the Ultra Mirage Full Face are sized. The cushion size must be the same size as the frame to function. Sizes cannot be mixed. For example: The Small Frame and Clip will fit Small Cushions (standard and shallow sizes)The Medium Frame and Clip will fit Medium Cushions (standard and shallow sizes)The Large Frame and Clip will fit Large Cushions (standard and shallow sizes) ©ResMed 2010 Used with Permission to all WebPages with ResMed picturesRESMED Minimum Internet Retail Price & POLICIES FOR THIS PRODUCT - We are only authorized to sell and ship Resmed products to end-users residing in the United States. A prescription is required for the purchase of certain products on this site including masks, humidifiers, and machines. Prescriptions can be emailed to email@example.com or faxed to 856-767-7151. All services are provided solely by The CPAP Shop and independently of the manufacturer. These services include the advertisement, ordering, sale, delivery, instruction, and setup of the products.