Contains antimicrobial properties that are effective against influenza, tuberculosis, MRSA, bird flu and others for up to 24 hours. Seven-layer construction with active carbon filter disables viruses at the cellular level, repels airborne moisture and filters fine particles. Works in three ways: keeps germs from penetrating, destroys airborne germs that contact it and prevents cross-contamination when exhaling. Ergonomically designed mask with adjustable strap also eliminates odors. Latex free. Size Group: One Size.