This Critical Cover PFL Particulate Respirator/Surgical Mask is a Positive Facial Lock (PFL), N-95 Particulate Respirator that meets the World Health Organization (WHO) and the Centers for Disease Control (CDC) recommended protection levels (where applicable) for many airborne contaminants. Plus, it is NIOSH N95 Approved (84A-0457 N95) and delivers the appropriate amount of filtration efficiency, and when combined with a trio of patented and unique design features, it also delivers the user a comfortable, custom fitting face mask; the integrated Magic Arch technology creates a breathing chamber within the facemask by holding it away from the user's nose and mouth while PFL technology, incorporating an integrated Twist Seal chin piece, helps the wearer create a perfect fit every time.