Choose coarse wool yarn, fine wool yarn, and fancy wool yarn for knitting sweaters. 1. Coarse wool yarn. High-grade coarse wool yarn of pure wool is spun from fine wool and is expensive. Pure wool intermediate coarse wool yarn made of medium wool. This wool yarn is coarse, strong, rich feel. The woven sweater is thick and warm, and is generally used for winter clothing. 2、Fine wool yarn. There are two kinds of fine wool yarn: stranded wool yarn and ball-shaped wool yarn (ball wool yarn). This wool line dry and clean, soft to the touch, beautiful 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. Fancy wool yarn in a wide range of colors, varieties are constantly renovated. For example, gold and silver clip silk, printing clip flowers, large and small beads, looped lines, bamboo, chains and other varieties. Woven into the sweater after each has a special charm.