Blue Isofluid FogFree Earloop Mask w/ Shield Level 1 (25/box X 4 = 100 masks total)Isofluid FogFree Earloop Mask w Shield Ideal for procedures where low amounts of fluid, spray and or aerosols are produced. ASTM LEVEL 1 Fluid resistance= 80 mmHg BFE > 95% at 3 microns PFE ? 95% at 0. 1 micron DELTA P, mm H2O cm2 < 4. 0 Meets EN14683 Rating Type II Standard Provides all features of Isofluid with addition of FogFree strip on inner layer and optically clear distortion free wrap around shield. Not made with natural rubber latex