A cushion cover (20) for a patient interface device (8) having a cushion (12) structured to receive a flow of treatment gas. The cushion cover includes a first portion (22) structured to conform to shapes of back surfaces (32) of the cushion and a portion of the side surfaces (34) of the cushion, a second portion (24) structured to conform to shapes of a remainder of the side surfaces of the cushion, and an opening (25) structured to allow treatment gas to pass therethrough, wherein the cushion cover is structured to fit over the cushion.
