Sweater is made of a machine or hand. In the original human life, people use leaves, animal skins to cover the body. People know how to use the weaving techniques in fishing nets in life. With the evolution of civilization and technology of the invention, the human not only make full use of all kinds of animals and plants and other natural fiber woven items required in life, they developed a variety of chemical fiber and mineral fiber to make human life more comfortable and convenient. Today, we usually use yarns to knit sweaters. Fancy yarns, like feather yarn, loop yarn, toothbrush yarn, napping yarn, bigbelly yarn can make sweaters more beautiful and comfortable.