Come and see our amazing products. Made of non-woven fabric. Double rubber bands, comfortable to wear, good elasticity. Breathable and dustproof. It fits for man and women. The normal size is 21". we also can provide 24 and 19". It is sold with non-imprint.The blue and white color are available in general. For big QTY, we can customized the color. Pls confirm with us about the packing info, stock color and exact production time before placing your order.