EXTENSIBLE AND RETRACTABLE FACE MASK.

摘要

There is provided a face mask having a mask portion that is extensible and retractable in at least one direction to improve the overall comfort and fit of the mask. The mask portion may be a composite of several materials or layers joined by any conventional process, provided that the composite is extensible and retractable. At least one of the materials and/or layers has properties of stretch and recovery that are imparted to the mask portion to render the mask portion extensible and retractable overall.