Size M: 5*11 inch. Adjustable tightness??closely fit, easy to wear and off??It feels comfortable on face, easy to breathe through. Face Cloth for dust can fully cover your nose and mouth. Breathable&Washable: 100% Polyester touches soft. Washing will not reduce the effect of anti-dust, more economical than disposable Cloths. Unisex mouth Cloth for men and women, ideal for protecting you from Dust, Smoke, Pollution.