Dust Masks Have A Great Filtering Effect Because of 5 Layers Filters Eco-friendly,Environmentally and Convenient. Air Pollution Mask is made of Cotton, M-shaped nose clip, Adjustable straps, Unisex size and 5 Layers PM2.5 N95 Activated Carbon Filter Insert. The adjustable elastic straps can adjust the size you fits most, men and women. According to the person face design, keep out the bridge of the nose the following part, without distortion, Effective fixed,to prevent the slide. If you wear it 1-3 hours a day, it is recommended to replace the filter once a month, If you use it for less than 1 hour a day, it is recommended to replace the filter every 45 days.
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