Granvela Active Carbon Filters Anti-dust Motorcycle Bicycle Cycling Racing Mask Bike Ski Sports Half Face Mask Filter - Colourful Active carbon filters: N99 filtration removes 99.9% of dust, chemicals, fumes and particulates. easy replaceable filters Dual valve exhaust: expels moisture buildup and easy to breathe Durable neoprene: comfortable to wear, adjustable velcro strap Replaceable filters and exhalation valves to keep the inside of the mask well ventilated Suitable for doing activities like biking, riding, snowboarding, or climbing. Weight: 50g