UNIQUE FEATURES: - Flip Pocket with Interchangeable Filter - Reusable and Washable Mask - Can be re-sterilized by brief soaking in boiling water - 3-ply for better filtration and protection - Comfortable and provides ease of breathing - UV treated for greater safety - Individually, hygienically sealed - Lightweight and stored in original plastic sac - Comfortable tight fit with elastic ear loop - Designed by Doctors, Nurses and Biomedical Scientists How to change the filter: 1. Wash your hand with soap and water for 20 seconds. 2. Rinse hands with ethanol sanitizer before removing the filter. 3. Put mask on a clean alcohol-wiped surface. 4. Open the pocket & remove the old filter. 5. Carefully place the new filter into the pocket. 6. Close the mask flap. 7. For better protection put the mask tightly over the nose and mouth.