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Material: Made of high quality nylon mesh material to breathe more smoothly， with the replaceable design, you only need to change the filter to isolates 95% of dust, pollen，particulates etc.
Two valves design： Equipped with two one-way breathing valves,reduce fogging and overheating exceptionally well.Also increase the efficiency of your lung capacity training to some extent.
Adjustable nose clip：The dust coveremploy an aluminum strip on the outside and has enough flexibility。Can be close to the curve of the face, prevent slippage, form a secure fit around the top of the cover.
Double strapping design：There is also a Velcro design tied to the back of the head to ensure a firm fit.This dust coveris a loop system which sits comfortably behind the ears to keep it immobility.
Multifunctional: Can be used to prevent dust, pollen, haze,etc. Suitable for outdoor activities, tourism, cycling, mountain climbing, factories and grain bins, off-loading, construction/demolition and other places.