10-Pack Viaex Technologies 74420 O2 Nano Mask Adult Large (L), Black 10-Pack Viaex Technologies 74420 O2 Nano Mask Adult Large (L), Black Pack of 10. New, Good condition. The O2 Nano Mask Filter features advanced 5-layer protection that blocks 99% of PM2.5 particles, including dust, allergens, bacteria, harmful gases, and wildfire smoke. Certified to EN143 European standards and verified through third-party testing, the filter delivers exceptional particle removal efficiency. Designed with comfort and simplicity in mind, the O2 Nano Mask blends seamlessly into daily life?from commuting to travel. Its reusable, machine-washable skin comes with three recyclable filters, each lasting up to 60 hours depending on air quality. For best performance, users should replace the filter once breathability noticeably decreases, ensuring continued comfort and protection. Listed By: Gabe (The Help Resale Team) "In matters of style, swim with the current; in matter of principle, stand like a rock" -Thomas Jefferson (A positive moment brought to you by Help Resale) About Us Welcome to Help Resale, your go-to consignment shop where value meets quality. At Help Resale, we're dedicated to providing you with an exceptional shopping experience, whether you're looking to find the best deals or consign your items. Need to buy a product, but don't see it in our store? Please feel free to reach out to us and we will help you find it! Help Resale 7200 Fair Oaks Blvd Suite 120 Carmichael CA 95608 Business Hours: Monday-Friday: 9:00 am to 5:00 pm (PST) All product and company names are trademarks TM or registered trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. (description exceeds maximum possible length)