3-Ply Filtering Face Masks, Pack of 503 Ply Filtering Face Masks, Pack of 50 These 3 Ply Filtering Facemasks reduce the spread of droplets (outflowing) and reduce the inhalation of particles and aerosols (inflowing). These 3 Ply, disposable Filtering Facemasks come in boxes of 50. They cover the nose and mouth comfortably, are breathable, will fit adults and most children, and are worn using attached elastic earloops. They also come with a flexible nose bar to conform to your face for a