About HOLIIBN MaskHealthy breathing:Active carbon filters isolate 99.88% of dust, chemicals, fumes and particulatesSmooth breathing:Unique ventilation design, excellent permeability, double air breathing valve, air resistance is smaller,smooth breathingFashion pattern design:Attractive appearance and is simple and lightweightComfortable fabrics:Diving fabrics, soft texture,comfortable to wearAdjustable Elastic Strap. One Size Fit Most Combination of ergonomics perfectly -- According to human face design, has a protective surface as the face size. The section of nose has sheet fixed to prevent sliding ,The mask can be further adjusted by hand to fit the unique features of your face.About the materialMask material: diving FabricsFilter material: activated CarbonInner cover material: Non-woven, activated carbonSome questions about the use of this product1:the mask can be wash.But you must put the filter down2:the mask filter can be replaced,Here is the step: Open the mask to expose the interior of the filter valve. According to the OPEN directions on the valve,turn the valve counter(clockwise),to separate the valve. Remove the filter. Replace the new filter,reverse the above steps,clockwise rotation of the valve,over.3:average size,stretchy and adjustable
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