The present invention provides an audio seal for use in an ear cup assembly. The audio seal has a generally torus-shaped body made from a compressible material. The torus-shaped body has a generally elliptical, torus configuration over approximately two-thirds to three-quarters of its perimeter and has...http://www.google.ca/patents/US6163615?utm_source=gb-gplus-sharePatent US6163615 - Circumaural ear cup audio seal for use in connection with a headset, ear defender, helmet and the like
