Nasal cushion including a confortable septum/nare seal

A patient interface device comprising:

• a mask shell adapted to receive a flow of breathing gas;
• and
• a cushion comprising:
• a first portion coupled to the mask shell;
• a second portion adapted to contact a surface of a user;
• and
• a wall portion extending between the first portion and the second portion, wherein the second portion comprises a septum region and alare regions disposed on either side of the septum region,
• wherein each alare region comprises a notched region positioned to be disposed adjacent to, without overlapping any portion of, a nostril of the user when the cushion is donned by the user,
• wherein the septum region is adapted to curl back a first distance (d1) from the user responsive to the cushion being donned by the user,
• wherein the alare regions are adapted to curl back a second distance (d2) from the user responsive to the cushion being donned by the user, and
• wherein the first distance is greater than the second distance.