Face Mask Features: 1. Pure cotton fabric and activated carbon filter layer. And it features the unique ventilation design, excellent breath-ability and ergonomic design. 2. The mask features an adjustable nose bridge and is suitable for a variety of faces, comfortable to wear. 3. The mask can isolate dust, particles, gas, pollution, and smoke. 4. Suitable for cycling, running, cycling, hiking, skiing, woodworking and other outdoor activities. 5. Can be cleaned and reused with more filter paper. Specifications: Material: Cotton Size: 9in x 5in Package comes with: 1 adjustable, reusable mask 2 PM 2.5 filter Please hand wash mask with soap and water before wearing and in between uses. Remove the filter before doing so. Placing it into the washing machine a few times will cause the round ventilation to eventually fall off. For sanitation reasons, we don't accept returns. Thank you for understanding.