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1 nose shell design, perfectly combined with facial curves, 2 six-point welding technology makes the inner liner and outer shell tightly combined; 3 cotton headband, sweat absorption is not tight; 4 hard shell, effectively resist stamping; 5 soft lining, reduce irritation to the skin; 6 high-quality filter material to ensure the inhalation and exhalation resistance lower than the standard requirements; 7 effective prevention of influenza, corona and other viruses;