These extremely durable N95 respirators are NIOSH approved. N95 masks are the optimal PPE to protect yourself from COVID-19 and other malicious pathogens. Designed to lay flush against the face to create a close facial fit, N95 masks block 95 percent of particles that are 0.3 microns in size making them the premier PPE in healthcare settings. These masks are tested on several factors including: filtration efficiency, particulate and bacterial filtration efficiency, biocompatibility, fluid resistance, and flammability.