There are two types of single-faced velvet and double-faced velvet. Single-faced fleece is mainly twill weave, also known as serge; double-faced fleece is mainly plain weave. The flannel has a soft body, is comfortable to wear, and has good warmth retention. It is suitable for winter underwear and pajamas. Printed flannel and yarn-dyed striped flannel are suitable for women's and children's spring and autumn outerwear. The flannel printed with images of animals, flowers, and fairy tales is also called Beibei velvet, suitable for children. Natural velvet, bleached velvet, mixed color velvet, sesame velvet are generally used as winter clothing, gloves, shoes and hat clips. The fleece fleece is formed by the repeated action of the steel wire needle point of the flossing machine, and a part of the fiber is pulled up on the surface of the grey cloth. The fleece is required to be short, dense and even. Printed flannels are brushed before printing, and bleached and variegated flannels are brushed at the end. The warp used for flannel grey cloth should be thin; the weft should be thick and the twist should be small. The cotton fiber used for spinning the weft should be thick and have good uniformity. The fabric has a smaller warp density and a larger weft density to make the weft appear on the surface, which is conducive to the formation of plump and uniform fluff from the weft cotton fiber. After the flannel is brushed, the weft strength loss is relatively large, so it is very important to master the quality of cotton yarn and the operation of the brushing process. Fluffy cotton cloth, single-sided or double-sided fleece, especially used for underwear and pajamas.