Review on Enhanced Comfort and Protection: Micro Dust Mask for Construction by Jack Robi

If you wear a mask on your face, your glasses will also fog up with "nose filters" if you breathe with your mouth closed. It's still cold here in the morning, breathing in and out through the nose filter, glasses still fog up. there is a lot of dust in the air where i work so i keep my mouth shut, breathing through nasal filters really helps.