3M 9502V+ Face Mouth N95 Respirator mask filters out more than 95% of exhaust, dust, chemicals, particles, pollen, smoke, and fumes, great for many occasions. Comes with an exhalation valve to reduce heat and humidity build-up inside the respirator, excellent permeability. With an adjustable nose clip, it helps effective seal and prevents fogging, keeps the mask away from slipping. Flexible and elastic knitted ear straps relieve ear discomfort, convenient and comfortable to wear. Safe and convenient for you to use.