KN95 masks are classed as a filtering face-peice respirator (FFR). These can also be called disposable respirators.
FFRs are subject to regulatory standards around the world. These standards are recommended by health authorities during a pandemic or emergency as the standards full-fill physical properties and performance that satisfy clinical health and safety requirements.
It is the most effective preventative accessory on the market. It has the ability to shield your respiratory system from any harmful agents such as COVID-19, bacteria, dust and other harmful agents.
The KN95 mask has a 5 layer design: