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Since it is so comfortable and fits well, I don't mind wearing it so it on my face instead of hanging on a hook. It is made of nonallergenic silicone that seals well. I particularly like the low profile that allows a wide field of vision and doesn't interfere with my glasses or other eye protection. I found it easy to breathe with the mask on so I'm not fight the system for air. I haven't done any studies of course, but I can tell a difference when I come in from a long day in the shop. If you have a dust problem give this mask a try.