The unique high-quality masks have a wide range of applications and are suitable for civil and industrial protection against particulate matter. The requirements for materials are extreme, and the comfort is greatly improved. From the outside to the inside, it is made of special shaped PP non-woven fabric, hot air cotton , Filter material, the innermost layer is skin-friendly PP non-woven fabric, you can choose whether you need to add a cold flow exhalation valve specially designed by SEMASK, and whether you need to add precision activated carbon cloth to achieve the effect of blocking odor.