Nose shaped shell design, perfectly combined with facial curve, convenient to wear glasses; no nose clip, no pressure on nose clip, no need to adjust trouble; six point welding technology, make the lining and shell closely combined; cotton headband, sweat absorption is not tight; hard shell, effective resistance to stamping; soft lining, reduce the stimulation to the skin; High quality filter material, greatly lower than the standard requirements of the inspiratory and expiratory resistance; prevention of avian influenza, SARS and other viruses; suitable for construction, stone mining, textile, grinding, metal casting, pharmaceutical, electronic, material processing and grinding operations of dust protection and other industries. It has good dustproof effect on sandstorm.