Kize masks have not been tested or certified by any administrative organization. They are personal use items only and are not a substitute for medical-grade equipment.
Filters can help to protect you from breathing in pollution, dust and other impurities in the air. The Premium Kize mask has a built in pocket that easily fits a variety of filters.
Particulate matter (PM) refers to particles in the air that cause pollution. Particulate pollutants vary in size. A PM2.5 filter refers to a filter that is able to filter out particulates that have a diameter of 2.5 micrometers or less. Filters are not washable and should be changed frequently.