The Uunique London Face Masks are reusable, washable and made with sustainable 100% cotton fabric. These fashionable face masks are supplied with a pack of 2 filters (PM 2.5), featuring 5 layers of filtration. The filters are made up from filter cloth, activated carbon & efficient filer cloth, inserted between layers of anti-sticking cloth for a comfortable wear. Simply slide the filter into the soft cotton mask for additional protection. The inbuilt bendable nose bridge makes it easier to seal around the nose area and comfortable, soft, adjustable ear straps can be used to provide a better fit.