Level 3 surgical masks provides the maximum barrier protection for any situation that exposes a person to heavy level of aerosols, sprays and fluids. They provide excellent protection limiting the risk of infection and high risk of fluid contact. Fluid Resistant 160mmHG This indicates the level of fluid and splash resistance. This is the maximum protection and accords with ASTM F1862-98 and ASTM F1862-00a standard testing methods for resistance of surgical face masks to penetration of synthetic blood at 160mmHg pressures. Hypoallergenic The materials are made from the highest-quality, providing comfort to those with sensitive skin and allergies. Breathability (Delta P) The level 3 surgical mask provides excellent breathability with a low delta P (<5). This means maximum comfort and coolness is achieved when in use. Delta P is a comfort measure of the mask breathability of the mask in relation to the user. The lower the P, the greater the comfort. Flammability Class 1 protection against any flame spread.