Very effective, uniquely comfortable! Its the only mask I buy for basic particulate filtration.
For an N95 mask, I've not found one that's more comfortable. Great for wood working or working in dirty environments (like crawl spaces, insulation install, etc). The one-way breather valve on the front of the mask works exceptionally well, and in cold conditions focuses breathing condensate to that area - ie, drips come from a single point - and the directional exhaust keeps condensate from forming on safety glasses. Masks lacking an exhaust valve tend to exhaust around the perimeter which causes safety glasses/glasses to fog. I keep one of these masks in my wood shop and reuse it many times before tossing. Over the period of a couple months, the straps, which are bare rubber, tend to fail, which is probably an unintended but good design feature which limits the number of times a mask can be reused; masks in general can experience breakthrough from overuse.
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