Patent ID: 7069933

Claim:
A mask cushion to sealingly connect a mask to a wearer's face, the cushion comprising: a nasal bridge region, a cheek region and a region opposite the nasal bridge region; a first membrane comprising a frame of resilient material having a first molded inwardly curved rim of said first membrane; and a second membrane of resilient material, said second membrane being thinner and more flexible than said first membrane, said second membrane having a second molded inwardly curved rim, said second membrane curved rim spaced a distance from said first membrane curved rim, said distance greater than a thickness of the first molded inwardly curved rim, said distance measured when the mask is not in use, a portion of said second membrane curved rim forming a face contacting seal structured to present a convex sealing surface with the wearer's face, wherein: the first molded inwardly curved rim of said first membrane is approximately 1.5 mm thick, and the second molded inwardly curved rim of the second membrane is approximately 0.35 mm thick.