Stoked On Salt Adult Face Mask - No Returns. 100% US Cotton. Washable and Reusable. Will shrink in first wash/dry cycle. These masks are not medical grade and are not to take the place of the N95 masks. They are not suitable for use in a surgical setting or where there would be significant exposure to liquid, bodily or other hazardous fluids, use in a clinical setting, or use in the presence of a high-intensity heat source or flammable gas.