Made from special ultra-lightweight, air-permeable material and featuring dual exhalation valves, this HEPA type, filtering mask affords protection against sub-micron pollutants including dust, pollen, mold spores and animal dander. Ideal for indoor and outdoor use. Adjustable Velcro closure provides a custom fit. Great looking and comes complete with one pair of replaceable particle filters. Large size fits most adults. Medium size fits small-faced adults and children over 12 years.