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Description: About this product Healthy breathing:Active carbon filters isolate 95-percent of dust, chemicals, fumes and particulates Smooth breathing:Unique ventilation design, excellent permeability, double air breathing valve, air resistance is smaller,smooth breathing Fashion pattern design:Attractive appearance and is simple and lightweight Comfortable fabrics:Diving fabrics, soft texture,comfortable to wear Adjustable Velcro:Velcro neck design ingenious,the size can be adjusted to meet the most head type Cleaning method: The whole masks can be washed, but please don not knead it, after naturally dry and you can use again About The Material Mask material: Diving fabrics Filter material: Activated carbon Inner cover material: Non-woven, activated carbon The steps about how to replaced the mask filter: 1.Open the mask to expose the interior of the filter valve. 2.According to the OPEN directions on the valve,turn the valve counter(clockwise),to separate the valve. 3.Remove the filter. 4.Replace the new filter,reverse the above steps,clockwise rotation of the valve,over.