<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.