Description: dust mask suitable for all kinds of outdoor activities where dust may be present. Such as: Mountain-biking Running Horse riding Snowboarding Moto-X Skiing Speed walking Climbing Cycling Walking Motorcycling , etc. Also applies to: Exhaust, Industrial emissions, Dust allergies, PM2.5. For maximized performance, the mask must be sealed properly around the nose and mouth, so that all inhaled air can pass through the filter. Features: 2. Made by high quality sponge material, breathable and comfortable. 3. Washable, can be repeatedly used. 4. Collapsible, you can put it inside your pocket and bring it anywhere. 5. Elastic widened ear strap design, wear easily, stronger and more comfortable. 6. An upgraded version of the breathing valve reduces heat and humidity, making it more comfortable to wear. 7.Free Size: for Men Women and Kids