It is a medical protective mask with ultramicroporous materials, which can more efficiently isolate various bacteria and viruses. 3-layer high-density filtration effectively isolates dust, viruses, droplets in the air, PM2.5. Resolve dyspnea. It has the advantage of higher barrier efficiency and long service life, which can replace non-woven fabrics and melt-blown fabric. Product Size: 15.5x10.5cm Material: Nonwoven fabric + ultramicroporous