Wool yarn is usually spun from wool, but there are also yarns spun from different kinds of chemical fiber materials, such as acrylic fiber, polyester fiber, and Persian fiber. Although there are many types of wool yarns, they can be divided into four main categories: wool yarn, fine wool yarn, fancy wool yarn and factory-specific knitting wool yarn. The types of yarn for wool clothing products are as follows 1. Coarse wool yarn: The density of the strands is about 400 te, usually into 4 strands, and the density of each strand is about 100 te. Pure wool senior coarse wool yarn is spun from fine wool and is expensive. Pure wool intermediate coarse wool is made of medium wool. This kind of wool yarn is thicker, stronger, and fuller in feel. The woven sweater is thick and warm, and is generally used for winter clothing. 2、Fine wool yarn: Stranded yarn density 167~398t, generally also 4 strands. There are two kinds of merchandise: stranded wool and ball-shaped wool (ball wool). This wool thread is dry and clean, soft to the touch and beautiful in color. With it is mainly woven into a thinner sweater, light fit, for the spring and autumn season, the amount of wool is less. 3. fancy wool: this product has a wide range of colors, varieties constantly renovated. For example, gold and silver clip silk, printing clip flower, the size of the bead, loop line, bamboo, chain and other varieties. Woven into the sweater after each has a special charm. 4. knitting wool: generally 2 single yarn strands, mostly used for machine knitting. This knitted sweater is characterized by light, clean, soft and smooth.