- 【Tested Filtration & 5-ply Barrier】KN95 face mask of 5 layers consists of two layers of melt-blown fabric which could filtrate over 95% particles physically, one layer of hot air cotton capable of filtering PM2.5 and outer layer of non-woven cloth to block large particles while skin-friendly inner one absorb the moisture from breaths. It is designed to apply more respiratory protection compared to a standard disposable 3-Ply mask.