3M Ultimate FX Full Facepiece Reusable Respirator FF-402 .

I have one of these and it's the most comfortable respirator I've ever used. For someone who needs or wants a full face respirator this is an excellent deal.
 
How well does it work if you wear glasses?
I wear reading glasses sometimes. I tried it one time with reading glasses and it was a bit tight but doable. Once I started working I hardly noticed it. YMMV. I think it's going to depend to some extent on your particular frames.
 
I took mine with me when I retired and I wear glasses. Like Sean said it will depend on your frames, with mine I had to tuck small pieces of rag or paper towels around were it contacted the frames or sand and dirt would blow in but that was in really bad conditions. In a knife shop you might be able to just cinch the straps tight enough and get a good seal.
 
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