You certainly don’t want to scrimp on dust protection, and these 3M™ N95 respirators are certified under NIOSH 42CFR84 to have a minimum filter efficiency of 95% or greater against dusts and other non-oil particulates, just like more expensive respirators. The 3M particulate respirator is lightweight and efficiently traps nearly all microscopic airborne particles. Double elastic headbands help keep the respirator snugged comfortably – important for an effective seal – and a foam nose pad backed by a flexible metal strip helps maintain that seal in the critical nasal area. Box of 20. NIOSH approved.