This face mask offers 2 layers of cotton fabric and an inner layer of 100% polypropylene to act as a filter External filter not required b/c of the filter layer sewn in Other features of this mask include: -Nose wire -Elastic ear loops -Reversible -Comfortable & lightweight -Washable Washing Instructions: -Wash in warm water and hang or dry flat -DO NOT iron or dry on a high setting This mask not for medical use & should be laundered before first use, as well as after every use.