Novemkada Dustproof Masks - Activated Carbon Dust Mask with Extra Filter Cotton Sheet and Valves for Exhaust Gas, Pollen Allergy, PM2.5, Running, Cycling, Outdoor Activities HEALTHY BREATHING:Coming with active carbon filters,our allergy mask separation of 98% of the dust, chemicals, particulates, gas, pollen, smoke and fumes.The dustproof mask can be used for anti-dust, anti-vehicle exhaust, anti-pollen allergy, anti PM2.5 and haze day protection. It is suitable for cycling, running, biking, hiking, skiing,woodworking and other outdoor activitie. PERFECT DESIGN: Adjustable nose clip, with unique ventilation design, a plurality of holes, excellent permeability, exhale, the valve of work out mask is opened without resistance, double air breathing valve, air resistance is smaller, smooth breathing.Perfect for spring, summer, autumn and winter wear. PREMIUM MATERIAL: The mesh of the dustproof mask cover is well built by premium Nylon, offering excellent permeability. Soft texture, quick drying, breathable and comfortable to wear.More thick and full Carbon fiber filter makes the filter layer more clean and sanitary. Suitable and important for your life. CONVENIENT REPLACE: The mask can be washed to keep clean, when they get dirty.And you can replace them with another new valves and filter cotton by yourself. LIFETIME WARRANTY AND MONEY BACK WARRANTY:Order now and if you dislike it within 90 days, we will buy back from you, 100% RISK FREE!