1-Ply 83% Polyester/17% Spandex moisture management fabric. Non-medical grade – does not replace N95 mask. Serves as an additional barrier to the outside environment for essential outings. Narrower base for tighter fit if worn upside down. Washable, Reusable. On the Flat Dimensions (S/M) Length 9″ Width @ Top 8″ Width @ Bottom 7″; On the Flat Dimensions (L/XL) Length 10″ Width @ Top 10″ Width @ Bottom 9″.