A nasal mask assembly (10) for preferred use in CPAP treatment. The mask assembly comprises a shell (12) and a cushion (14). The cushion is connected with the shell for engagement with the face of a user. The cushion has a side wall (82), an inner wall (88a) extending transverse to the side wall, and an outer wall (88b) extending transverse to the side wall. The outer wall is adapted to engage and seal against a face of a user of the mask. The outer wall of the cushion extends substantially completely around the cushion. The inner wall of the cushion is discontinuous in a nasal bridge region of the cushion.
