The Urban Mask is tested with equivalent results of the American N95 or European FFP2 performance ( Test: GB2828 & Certification: KN95 ) Replaceable Active Carbon Filter protects user from vehicle fumes, hydrocarbon gases and reduces odor. Exhalation Valve that helps in easy breathing and prevents fogging in the goggles. Comfortable Elastic Neck Strap prevents ear pain and discomfort. Adjustable Nose Clip creates a tight seal around the nose bridge for maximum protection. Dust resistant cotton for cleaner and long lasting protection. Color: Black Metro Mask: URBAN is the new generation advanced air pollution mask that filters up to 99% of dust and pollutants in the air. Metro-Mask: URBAN is very effective, durable and at the same time very comfortable to wear. Frequently Asked Qustions: 1.WHAT CAN METRO MASK FILTER OUT ? - Equipped with advanced electrostatic, micro-fiber and active carbon filtration technology. The Metro-Mask: Urban is designed to protect against the following particles. - AIR POLLUTANTS (INCLUDING PM10, PM2.5) - POLLEN - BACTERIA AND VIRUSES - SMOG - Automobile exhaust and smoke - Odor and fragrance - Animal Allergens. 2. HOW LONG CAN I USE ONE FILTER ? - The working life of a filter depends on many factors such as the pollution level in your surroundings. On average our filters last about 100 hours. If you use it approximately 3hr everyday in Kathmandu's condition we advise to change every month for hygienic reasons. 3. CAN I WASH THE FILTER ? - The filter can NOT be washed. The filter if soaked in water is damaged and the filtering efficiency will be reduced. 4. CAN I WASH THE MAIN MASK ? - Yes, you can hand wash the main mask with a little mild detergent. Detach the filter and the valves before washing. Do not store it in a bag unless fully dried. 5. SIZE AVAILABLE ? - Our Small size fits most kids/adults of weights 25 - 45 KGs. Please check other item for Medium size. Brand Metro-Mask SKU 100648254_NP-1021084368 Model PM2.5 Mask with 1 Exhalation Valve, KN95 Certified