KN95 Masks are generally made of more than one layer of synthetic material. They typically have two straps that sit behind the ear, and they filter out 95% of particles smaller than 0.3 microns. The industry standard KN95 masks, however, there are some differences between the masks.

They are a suitable alternative to N95 masks
The KN95 mask is an alternative for those who find it difficult using an N95 Mask. These masks provide the same protection as N95 respirators and are preferred by health officials in high risk settings. A cloth mask is more comfortable, especially for those who exercise. A cloth mask is easier to clean, can be worn under a disposable mask, and is also more comfortable than a conventional N95 face mask. One contender in the breathable face mask category is the Under Armour Sportsmask, which is composed of three layers of breathable fabric and does not cling to the face. It can also offer cooling effects depending on its size.
The KN95 is a N95 respirator helmet that is safe, effective, and inexpensive. These disposable masks are available on accumed.com/kn95-mask-for-sale-respirator-safety-mask-k1.html and are made from non-woven material and hypoallergenic.
They are made in China
ECRI, a non-profit organization that helps people find reliable, safe medical supplies, has published new guidelines for choosing personal protective equipment (PPE), and respirator masks. Project N95 recommends that you review the lab testing documents before purchasing any face mask. These documents may be made available online by some brands, but others may only make them available on request.