A cushion assembly for a patient interface for treatment of sleep disordered breathing of a patient, comprising: a nasal cushion structured to seal around the lower periphery of the patient's nose; a nasal plenum chamber joined to the nasal cushion; an oral cushion structured to seal around the patient's mouth; an oral plenum chamber joined to the oral cushion; a decoupling structure connecting the nasal cushion and the nasal plenum chamber to the oral cushion and the oral plenum chamber, the decoupling structure configured to allow the nasal cushion and the nasal plenum chamber to move relative to the oral cushion and the oral plenum chamber; a pair of side supports, each of the pair of side supports located on an opposite side of the nasal cushion and joining a corresponding lateral side of the nasal cushion to the oral cushion; a pair of protruding ends positioned posteriorly on the nasal cushion; a pair of undercushion support walls that each supports a corresponding one of the pair of protruding ends; and a pair of pockets (3208.1), each of the pair of pockets (3208.1) located on an opposite side of the nasal cushion, each of the pair of pockets (3208.1) including an upper surface (3106.4) defined by the nasal cushion and the nasal plenum chamber, each of the pair of pockets (3208.1) including a lower surface (3106.6) defined by the oral cushion and the oral plenum chamber, and each of the pair of pockets (3208.1) including side surfaces defined by the decoupling structure and a corresponding one of the pair of side supports, wherein each of the pair of pockets (3208.1) is open in an anterior direction of the cushion assembly when the patient interface is donned by the patient. a nasal cushion structured to seal around the lower periphery of the patient's nose; a nasal plenum chamber joined to the nasal cushion; an oral cushion structured to seal around the patient's mouth; an oral plenum chamber joined to the oral cushion; a decoupling structure connecting the nasal cushion and the nasal plenum chamber to the oral cushion and the oral plenum chamber, the decoupling structure configured to allow the nasal cushion and the nasal plenum chamber to move relative to the oral cushion and the oral plenum chamber; a pair of side supports, each of the pair of side supports located on an opposite side of the nasal cushion and joining a corresponding lateral side of the nasal cushion to the oral cushion; a pair of protruding ends positioned posteriorly on the nasal cushion; a pair of undercushion support walls that each supports a corresponding one of the pair of protruding ends; and a pair of pockets (3208.1), each of the pair of pockets (3208.1) located on an opposite side of the nasal cushion, each of the pair of pockets (3208.1) including an upper surface (3106.4) defined by the nasal cushion and the nasal plenum chamber, each of the pair of pockets (3208.1) including a lower surface (3106.6) defined by the oral cushion and the oral plenum chamber, and each of the pair of pockets (3208.1) including side surfaces defined by the decoupling structure and a corresponding one of the pair of side supports, wherein each of the pair of pockets (3208.1) is open in an anterior direction of the cushion assembly when the patient interface is donned by the patient.