This is a spare refill to be used in U-Mask Model 3 cover. U-Mask Model 3 is an innovative, biotech, reusable face mask that counteracts the passage of external microorganisms, offering specific protection against the smallest aerosols and particles with no compromise on comfort. U-Mask Model 3 features a new, nanofiltration layer and improved enveloping design, useful in work and professional contexts, travel, and in public places. U-Mask Model 3 is a FFP2 R D mask. Certified as category III reusable PPE (Personal Protection Equipment) compliant - with EN 149:2001 + A1:2009, it comes in new packaging with eco-friendly biodegradable material (EcoPure®). Designed by U-Earth. Made in Italy. Learn more about the tests here https://u-earth.store/pages/u-mask-technology