3 ply mask- 2 ply unbleached Cotton Muslin with logo print and one layer of MERV 14/ 2800 MPR rated filter. Has a metal wire at nose bridge for better adjustment. This is not a medical mask, therefore we cannot guarantee the efficacy of this product. However the filter that is inside is a real filter by 3M, used to capture ultra fine particles. It is electrostatically charged, made of polypropylene and polyolefin, and captures particles as small as 0.3 microns. Because of the electrostatic charge, do not machine wash. Carefully handwash, or spray with a disinfectant like hydrogen peroxide. Let it evaporate, and don't inhale. Unisex. Handmade in USA. Pls note: Because Cotton Muslin is unbleached, you might see brown particles inside the fabric. They are NOT dirt, they are particles from the Cotton flower.