One unit consists of a mask (folded) + 10 x Nano Clean Air filter Patented nanofiber technology that catches all dangerous viruses and bacteria. The mask consists of two components: Textil mask - made of 100% cotton - material with Ã?ko-Tex Standard certification - double-layer with filter pocket - washable at 90 ° C - available in several sizes and two cuts NANO CLEAN AIR filter - catches 99.9% of viruses and bacteria - breathability 200 l / m2 / s - easily replaceable - disposable - it does not contain toxic substances - maximum endurance up to 12 hours - The Nano Clean Air disposable filter achieves maximum efficiency more than 99.9% of viruses and bacteria are detected. - The cotton drape is extremely hygienic. The materials used are international Ã?ko-Tex Standard certification. It is suitable for repeated use. - The filter is a sandwich laminate of polypropylene. In the middle is a layer of nanofibres. - The filter is very effective but at the same time comfortable and breathable. It is light and breathes easily. - Thanks to its high breathability (200 l / m2 / s), it is also suitable for production plants. - For best results, we recommend replacing the Nano Clean Air Filter in a cloth every 12 hours. - The effects of the Nano Clean Air filter are confirmed by a certificate in Nelson Labs. - Testing was performed in accordance with US FDA regulations about Good Manufacturing Practice (GMP) 21 CFR, Parts 210, 211 and 820. - The combination of cotton drapes and the unique Nano Clean Air filter is the ideal protection against coronavirus and COVID-19.