A patient interface device for use in delivering a flow of a breathing gas to the airway of a patient includes a frame formed of a substantially rigid material and a flexible airway formed of a pliable material. The flexible airway includes: a first end having an aperture defined therein which is structured to be coupled to a gas delivery conduit for receiving the flow of breathing gas； a second end disposed opposite the first end and coupled to the frame, the second end having a sealing flap extending radially inward from a periphery of the second end which is structured to sealingly engage the face of the patient about the airway of the patient； and a wall portion extending between the first end and the second end, the wall portion defining a passage adapted to convey the flow of breathing gas from the first end to the second end.
