O2 Armor is a convenient nasal filter that effectively blocks dust, smoke, ash, pollen and other airborne crud encountered at work, home, shop or at play. Welders and Fabricators count on O2 Armor when other respiratory protection doesn't work for them due to facial hair, comfort or convenience. O2 Armor is made from a medical grade plastic with a built-in electrostatic filter material from an established supplier. Filter effectively blocks to 90% efficiency at 10 microns and 65% at 2.5 microns. Users experience significant reduction in the volume of "black boogers" at the end of the work day and many wish this product was available "20 years ago". Get O2 Armor and support you and your team from the non stop presence of hazardous airborne dust and crud they encounter while welding, grinding, clean up and just being in the work area.