Don’t fog up glasses.
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this works for me but is valved http://www.gvs.com/product-family/223/1035/ …
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Reduce pressure on nose and ears.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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A good deal without needing a tight fit. It’s the feeling of something pressing against my face that makes it so annoying for me
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Oops i meant “seal” not deal
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Is "not fog up glasses" encapsulated in one of these?
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Maybe “don’t build up moisture”? That’s why I’m voting for it...
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battery powered positive pressure masks; allowing use of really good filter media without any added breathing resistance.
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I was thinking about that, it's tricky though considering the volumes
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