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The three-stage folding design makes it easy to fit and easy to wear. The high efficiency filter is applied and the defense is excellent. It is a three-dimensional structure with high airtightness and easy breathing. The inner space of the mask is wide, and it is comfortable even for long time use. Things to consider Do not use a towel, tissue paper, etc. on the respirator and wear it on it. Do not use if the inside of the mask is contaminated. Do not crush or deform the mask. Do not use in places where the oxygen concentration is less than 18% and are not breathable. Do not wash it. Do not touch the surface of the mask after wearing it.