Breathe Healthy masks utilize the state of the art, hospital safe, non allergenic Aegis hi-tech performance antimicrobial treatment that lasts for the life of the mask. Breathe Healthy masks have been tested by a leading lab to filter down to 1.0 micron, and when adjusted to fit snugly, help to protect against pollen, dust, pet hair & dander, allergens, mold spores, many bacteria, effluents from coughs and sneezes, and many of the particles that pollute the air (all 1.0 micron or larger). This filtration, along with the hydrophobic/hydrophilic ("moisture wick and repel") technology allows the wearer to breathe easier while lawn mowing, gardening, grooming the family pet, leaf raking, bicycling, working in the office, commuting on a train, carpooling, wood working... performing many of the day-to-day work and recreational activities. Not only do Breathe Healthy masks help protect you, they also help to protect those around you. For additional details, please see our tab "About Our Masks".