These Fold Flat Face Masks are designed to reduce the inhalation of fine breathable dust and are useful when working with brick dust, concrete, plaster, insulation and sandstone. The masks are ergonomically designed for an efficient and comfortable fit. Easily folding flat when not in use, these maks can be stored or pocketed without reducing hygiene standards. These face masks are valved for easier exhalation, with less moisture build up. FFP1 reduces the wearers exposure to airborne particles by a factor of 4.