Innovative technology that allows moisture to wick away from the mouth and face. High performance PTFE membrane that provides filtration. Comfort and lightness. 100% hydrophobic and acid-resistant. Bacteria filtering efficiency greater than 99% (BFE). Flexible and adjustable nasal band and ear clip. Hypoallergenic. Free of latex and fiberglass. Level 3 mask. Box of 50. Made in Canada.