The 3M™ Ear Loop Face Mask features slip-on convenience, and provides fluid resistance and >99% Bacterial Filtration Efficiency (BFE) at a mean particle size of 4.0 microns. Fluid resistant to help reduce potential exposure of the wearer to blood and body fluids. Greater than 99% Bacterial Filtration Efficiency (BFE) when challenged with a mean particle size of approximately 2.7 microns. Convenient ear loop design allows you to slip on and remove mask quickly and easily. Ear loop mask is soft and lightweight for comfortable wear. Protection Rating: No ASTM Rating