5- Layers of Filtration - Smog Guard N99 Mask is one of the best standard five layered filtration face mask that provides 99.97% protection from PM 0.3 micron and above, harmful gases and cross-infection. Layer 1:- Polyester Microfiber; Layer 2:- Melt Blown| Bfe-99%| Pfe-99%| Polypropylene; Layer 3:- Paper Melt Blown| Bfe-99%| Pfe-99%| Polypropylene; Layer 4:- Activated Carbon Fabric; Layer 5:-bamboo Fabric/cotton Fabric Laye.
