Three Layer Construction. Soft & Breathable Fabric. Washable & Reusable. One Size Fits Most Adults. All Sales Final - No Returns. Not be used in any surgical setting or where significant exposure to liquid, bodily or other hazardous fluids, may be expected; in a clinical setting where the infection risk level through inhalation exposure is high; or in the presence of a high-intensity heat source or flammable gas. No warranties that the mask prevents infection or the transmission of viruses.