besungo dust mask with filter,sports face mask, 5 filters and 2 valves included,men's and women's universal masks,suitable for woodworking, outdoor activities besungo <b>use--- please check seller feedback before purchase. make sure you are buying from besungo for authentic product. </b> <br><br><b>1 mask (including 1 filter) + 4 filters. </b> <br><br><b>nose to chin length: 6 1/3 inches</b> <br> <b>velcro size:5.2 in</b> <br> <b>nose to rear: 13 inches</b> <br><br><b>healthy breathing:active carbon filters isolate 99-percent of dust, chemicals, fumes and particulates</b> <br><br><b>smooth breathing:unique ventilation design, excellent permeability, double air breathing valve, air resistance is smaller,smooth breathing</b> <br><br><b>unique design:nylon and spandex, very soft and comfortable, light texture, soft texture, fast drying, breathable, comfortable to wear.</b> <br><br><b>adjustable velcro:velcro neck design ingenious,the size can be adjusted to meet the most head type</b> <br><br><b>mask specifications:</b> <br>type: dustproof and windproof mask <br>size: one size <br>material:nylon and spandex <br>function: windproof and dustproof <br>season: spring, summer, autumn, winter <br><br><b>mask occasion:</b> <br>suitable for running, cycling, hiking, skiing, crafts, gardening, anonymity and other outdoor activities, such as tourism, hospitals, public places. <br>suitable for children, the elderly, pregnant women, women, men, teenagers, etc. <br><br><b>the steps about how to replaced the mask filter:</b> <br>1.open the mask to expose the interior of the filter valve. <br>2.according to the open directions on the valve,turn the valve counter(clockwise),to separate the valve. <br>3.remove the filter. <br>4.replace the new filter,reverse the above steps,clockwise rotation of the valve,over. <br><br><b>packing:</b> <br>1 *dust mask(included 1 filter ) <br>4* filters<br><br><b>attention: :</b> <br>1. mask is washable while filter pads are not, and it is advisable to replace a filter pad after using it for 7 days. <br>2. please insert filter pad into mask in the same way as shown in picture before using.