Anti-Pollution Mouth Mask Anti-Dust Cycling Mask Activated Carbon Filtration Exhaust Gas This sports mask has a high-efficiency filter layer, soft earloop, the valve can be replaceable. It can be applied in electronic manufacturing, dust-free workshops, catering services, food processing, environmental cleaning, etc.  <br/>Features:<br/>- Simple design, lightweight and portable. Suitable for most people.<br/>- With adjustable HOOk&amp;LOOP, this mask is not easy to fall off.<br/>- Fit comfortably under helmet. Avoid inhalation of automobile exhaust when you&#39;re riding.<br/>- Good Protection against gases, smells, PM 2.5, second smoke, pollen and particulates.<br/>- Suitable for outdoor activities such as running, jogging, biking, cycling, riding, hiking, skiing, snowboarding.  <br/>Note:<br/>- The cover of mask is washable. Please take off the filter when washing( the activated carbon filters can&#39;t be washed).<br/>- Under normal circumstances, the filter is recommended to be replaced every 30 days. If the the mask used frequently, please replace the filter when it became black or be damaged.<br/>Specifications: Package size: 210 * 200 * 35mm  Package weight: 54g<br/> The filter will provide comfortable protection for you. 5 layers of material, the pad can effectively filter dust and other harmful substances. Odor-proof, dust-proof, gas-proof, and haze-proof, etc. Wide application, suitable for kinds of PM2.5 covers. Easy to use, very practical.