Patented Nano-fiber Filter Technology Powerful 1 micron filter (viruses and germs range from 2-10 micron in size) Ultra-light for comfortable all-day wear Permeable, breathable and skin friendly Anti-moisture, Anti-dust and Anti-fog Suitable for Indoor and Outdoor wear UV protection 3-D Ergonomic Design for comfortable fit Comfortable elastic ear bands Certifications: ISO 9001; ISO 14001; SGS; REACH; RoHS and FDA 510K