| 摘要 |
An apparatus comprising: a mount plate and at least one noise reduction element connected the mount plate. An article of head wear comprising: a shell having an upper portion and a lower open portion, at least one aperture located near the lower portion, and a noise reduction plate obstructing the at least one aperture. An article of head wear comprising: a shell having an upper portion and a lower portion, and a noise reduction element connected to the shell. A noise reduction element comprising: a frame having a framework, and a soundproofing element covering the framework. An apparatus comprising: a mount plate, and at least one aperture in the mount plate, wherein the aperture is formed to accommodate a noise reduction element.
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