It Is Very Soft, Breathable, Water-Repellent, And Washable. The Buckle Has Adjustable Elasticity. You Can Change Its Length According To Your Facial Contour To Prevent Leaving Marks On Your Face After Taking It Off. It Can Protect Your Face And Lips From Smoke, Cold, Allergies, Fog And Haze, Exhaust Gas And Low Temperature, Allergic Substances, Etc.