Helmet Reusable Washable Dust Filter and Reusable Mouth Warm Windproof Cotton Face

100% Polyester. Very Soft, Breathable, Waterproof, Washable The Elasticity Of The Buckle Can Be Adjusted. You Can Freely Change Its Length According To Your Facial Contour. Equipped With Two Activated Carbon Filters With Replaceable 19-layer Protection, M-shaped Nose Clip. Protects Your Mouth And Face From Dust, Cold, Dust, Allergies, Pollen, Fog And Haze, Passive Smoking, Exhaust Emissions, And More Suitable For Camping, Cycling, Running, Traveling, Climbing And Daily Use