The Disposable Face Mask for Civil Use has about 90% filter efficiency and is intended for general purpose that can shield you from infection and other contagious diseases. When properly worn, it can reduce the chance of potential contact by the wearer to blood and bodily fluids, however, it does not completely eliminate the risk of contracting any such infection. It is necessary to change the masks immediately if splashed with blood or bodily fluid. Also, this is for civil use, and should not be used for medical or surgical purpose. It is soft, odorless and does not cause irritation.