5D Mask, a mask that Kills Viruses and Germs on contact, a new generation of masks designed to kill and protect from COVID-19 ... and other viruses, bacteria and fungus. It uses Solid Alkali with patented technology to self disinfect, sterilize, deodorize effectively and continuously. Solid Alkali is 100% harmless to humans, animals and plants, certified by SGS the world’s leading testing and certification organization. Chlorine Dioxide has been classified by the World Health Organization (WHO) as the most safe, green and effective sterilizer, disinfectant, deodorizer. The 5D mask can be used effectively for up to 30 days, a total of 4 layers of non-woven fabric to provide an effective defense against PM2.5 particles while retaining high breathability Very comfortable to wear and easy to speak while wearing for hours at a time. read more