Cushion for a respiratory mask assembly

A cushion for a respiratory mask assembly for treatment of sleep disordered breathing, the cushion comprising:

• a face-contacting portion configured to form a contact seal with a patient's face;
• a non-face contacting portion configured to connect to a frame;
• and
• a central portion that interconnects the non-face contacting portion and the face-contacting portion,
• wherein the non-face contacting portion, the face-contacting portion, and the central portion at least in part form a cavity,
• wherein the face contacting portion includes a side wall and a membrane that extends generally laterally inwardly from the side wall towards the cavity,
• wherein the central portion includes a recessed portion recessed at least in part towards the cavity,
• wherein the recessed portion includes a first connection wall and a second connection wall connected to the first connection wall,
• wherein the first connection wall is disposed nearer to the face-contacting portion than the second connection wall,
• wherein the first connection wall extends generally laterally inwardly from the side wall towards the cavity and terminates at a tip section, and the second connection wall extends generally laterally outwardly from the tip section away from the cavity,
• wherein the first connection wall includes a length that is different than a length of the second connection wall, and
• wherein the side wall includes a thickness that is greater than a thickness of each of the first and second connection walls.