dustproof, breathable, smog-proof, pure black anti-dust cotton 100pcs mouth face mass cycling wearing black clothing cot

please be kindly noted,the listed product is produced and distributed abroad and subject to the laws of its country of origin. pls note that: 1)this dustproof mask is just for keeping warm, not available for other's purpose. 2)better to wash it before using. 3)the material of normal quality is leftover bits and pieces, which is not so good. if need better one, pls choose cotton.