Filter Neoprene Dustproof Mask Pollution Mask Added Activated Carbon Filtration Layer for Exhaust Gas Anti Pollen Allergy PM2.5, Sports Half Face Mask for for Running Cycling Motorcycling Skiing Blue Activated Carbon Dust Mask: Non-woven, activated carbon filter layer. With unique ventilation design, 42 holes, excellent permeability, exhale, the valve of work out mask is opened without resistance, double air breathing valve, air resistance is smaller, smooth breathing.uitable for motorcycles, bicycles, racing, skiing Ergonomic Design: The face mask respirator according to people's face design, protection is more in place; Anti dust mask is shock-proof, Humanized design, exquisite aluminum, fixed nose, to prevent falling. Multifunction: The face mask is generally used for windproof and dust-proof when you riding or in winter, it also work great for H7N9 Avian Influenza, PM2.5, Cold virus, Automobile exhaust, Haze days, Dust allergy, Industry exhaust. One Size Fit Most: Adjustable Velcro, the black of the neck area designed with the velcro, compact design, easy to adjust the size; One size, fit for range 48-57cm, suitable for men and women. Multi-Purpose: Our cool dust mask is suitable for cycling, hiking, skiing and other outdoor activities, also can be used as haze day protection, anti-dust and so on. Also it could work as part of a Halloween costume or add some "cool" factor to a kids bike riding.