Scuba Mask Identification
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Nose Piece
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The area that distinguishes scuba masks from swimming goggles is the nose piece, which puts the eyes and nose in the same air space. This is so that pressure in the mask can be adjusted via equalization (blowing into your mask through your nose to make the air pressure comfortable). Some masks have a nose piece with a purge valve (valve to clear water from the mask) for equalization.
Materials
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Higher-quality masks are made from silicone rather than traditional rubber. This material is more durable and comfortable on the face.
Volume
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Scuba masks come in a wide range of different volumes. User choice defines whether a large air space or small air space to equalize is desired.
Windows
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The windows on a mask are either a single lens or twin lenses, with bridges diving the lenses like glasses. Some masks are also equipped with side windows for peripheral vision.
Straps
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Straps should be thick enough to hold the mask comfortably on the head and to include a snorkel holder on one side.
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