Environmentally friendly fabric, easy dust proof, comfortable and breathable, environmentally friendly antibacterial fabric, adjustable size, children, small face, big face, can be washed repeatedly, no deformation, multiple use, 3D three-dimensional let you wear without worry. Adult\'s 4-layer three-dimensional structure Autumn and winter dust-proof, wind-proof, warm, washable, adjustable masks 3 monochrome, various colors and specifications, please consult customer service for details