BCR® 3-Layer Face Mask with Knitted Earloops (180mm) features a medium filter of meltblown polypropylene for excellent particle and bacterial filtration. Its polyethylene outerfacing is ideal for extremely critical environments. The mask's polypropylene interfacing is soft and non-irritating for extended wear. The mask also features knitted nylon earloops, a fully enclosed, adjustable nosepiece, and tempered aluminum. Ultrasonic bonding reduces contamination and outgassing.