HIGH QUALITY: Dust Mask is made of high-quality materials. Each mask respirator is crafted with five layers of support that contains activated carbon, melt-blown cotton, and non-woven fabric.with adjustable straps and nose bridge to prevent slipping. Fit a variety of face, comfortable to wear. DOUBLE FILTERING: This Face Mask with PM2.5 Filtersand breathing valve, can allow air to enter the body while keeping moisture out. It also keeps you away from toxins and harmful substances in the air. PROTECTS: This dust respirator can be used to protect you from harmful dust particles, PM2.5, vehicle exhaust, woodwork, pollen allergies, and fumes. Ideal for people living in or travelling to areas with high air pollution / smoke levels. 3 ACTIVATED CARBON FILTERS: Each mouth mask also comes complete with 3 pcs PM2.5 carbon replacement filters for longer-lasting use at home or when traveling. NOTE: Filter insert can not be cleaned and should be replaced every 1 weeks; When film or sticky sediment stains emerge, please replace the filter.