Those of us with beards and mustaches (and glasses) field-tested it in the workshop and loved it. A lot of thought and experiential knowledge has gone into the design. For one, the dual filter discs draw from the back, away from the source of dust and particulates in front of you. Another unique feature is that your exhale is directed downward, not up into your goggles, face shield, or glasses. And it won’t interfere with ear plugs or hearing aids. The air filter even works with most welding helmets. It is easy to take on and off, and it balances on the shoulders. Comes with two dust filters. Two-pack replacement filters are also available.