Wismemo Anti-pollution Cycle Bike Bicycle Sports Mask Protection with Air Pollution Filter (Black) Dustproof, windproof, sandproof Ideal protection for outdoor activities Durable neoprene: comfortable to wear, adjustable velcro strap Dual valve exhaust: expels moisture buildup and easy to breathe Active carbon filters: n99 filtration removes 99.9 percent of dust, chemicals, fumes and particulates