a nasal bridge region, a cheek region and a lower region below the cheek region;

a substantially triangularly-shaped frame of resilient material having a first molded inwardly curved rim; and

a membrane of resilient material, said membrane being thinner and more flexible than said first rim, said membrane having a second molded inwardly curved rim, said second rim spaced a distance from said first rim, said distance grater than a thickness of the first rim, said distance measured when the mask is not in use, a portion of said second rim forming a face contacting seal,

wherein the membrane has a thickness of about 0.35 mm and the rim has a thickness of about 1.5 mm.