A cushion (26) for a patient interface device includes a support wall portion and a sealing flap (40) extending in inwardly from the support wall portion and toward a longitudinal axis of the cushion. The sealing flap has a distal edge (44)which defines an opening (46) in the sealing flap. The opening extends from the nose bridge to the upper lip and is created by two planes (hinged nearer the upper lip) that intersect at a large angle (e.g., 90 degrees to 150 degrees) near the upper lip.
