This FFP2 NR mask by Changanda is a self-filtering and protective mask for nose and mouth. It is made with materials composed of nanoparticles, designed to effectively prevent exposure to airborne pathogens, bacteria or infectious viruses. Its patented state-of-the-art design helps filter outside air. It offers up to 99% efficiency and helps filter out microorganisms, bacteria, particles and other agents from the environment, helping to prevent respiratory diseases and viral transmission. It has a comfortable ergonomic design with adjustable side straps made of hypoallergenic rubber for easy fitting. Made in white and one size fits all. Recommended duration of use: 8 hours approximately. This product is not reusable.