| http://www.w3.org/ns/prov#value | - Therefore, mask seal member 40 is preferably made from a lightweight, flexible, and soft material, preferably a thermoplastic elastomer, such as silicone, so that it is comfortable yet offers a relatively tight seal with the patient. [0021] Mask body 38 supports seal member 40 and is typically formed from a material that is more rigid than the seal member, such as a rigid or semi-rigid plastic.
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