Western BlueBird photo on Face Mask Reusable Cotton Face Mask,. 4 ½ X 7 ½”. These masks include a PM 2.5, which may already inserted into the mask . Our masks stack multiple layers , outside 95% Polyester and 5% spandex, inside is 100% pre-washed cotton. The CDC has adopted a safety-first policy and is recommending everyone wear non-medical protective face coverings to help "flatten the curve"