Granvela Active Carbon Filters Anti-dust Motorcycle Bicycle Cycling Racing Mask Bike Ski Half Face Mask Filter N95 active carbon filters remove 99.9% of dust, chemicals, fumes and particulates; easily replaceable filters. Conforms to the shape of human faces for better comfort and fit; fixed aluminum sheet prevents the mask from slipping. Dual valve exhaust helps to expel moisture buildup and makes breath easy. Made of neoprene for great durability, adjustable velcro strap for great fit, it is comfortable and convenient to wear. Very lightweight (50g), the mask is suitable for various activities like biking, snowboarding, and climbing.