The KN95 respirator stops at least 95% of particles that are greater than the .3 microns in size. This is done through the multi-layer construction for protection against dust, fine particles, pollen, and other airborne particles. These masks, like all masks, require the user to be clean-shaven to form a tight seal. But more than that they are great for protection from other respiratory issues that are common in industries like construction and other trade industries. The flexible fabric is easy to fit the face with a convenient flexible nose bridge while still allowing low breathing resistance. Held in place by elastic loops that go around the ears for quick and easy wear.