Cover yourself your family and your customers with this 5-filtration-layer Protective Face Mask. It meets all the KN95 standards with an extra filtration layer added. N95 masks are the US standards for respirator masks; KN95 masks are the Chinese standards for masks. These are the requirements that the US National Institute for Occupational Safety and Health requires manufacturers to meet in order to label their masks as N95s. Despite the long list of differences the two masks are equivalent or nearly equivalent to the features that most people care about. *Not intended for medical use.