The present invention relates to a patient interface structure for delivery of respiratory therapy to a patient, comprising: a frame comprising connectors configured to connect to a headgear; and a
cushion assembly comprising: a mouth seal defining a
breathing chamber and being configured to seal around the patient's mouth, the mouth seal comprising a mouth seal aperture configured to accommodate the patient's mouth; a nasal seal integrally formed in one piece with the mouth seal and configured to sit under the patient's
nose and to seal around the patient's nares; and a
cushion clip, the
cushion being configured to be connected to the frame by the cushion clip, the cushion clip adding stiffness and rigidity to the cushion
assembly and being configured to snap onto the frame; wherein the patient interface structure comprises an air inlet formed with the frame, the air inlet comprising a tube connection portion adapted to receive a tube or a tube connector and a protruding edge adapted to be received in an aperture of the cushion
assembly.