Sweaters containing 10% Yi Rong vines will pilling. According to the public information of relevant information, 100% cashmere coat will not pilling. If the quality of cashmere is good, the pilling is not pure cashmere. The fiber of cashmere itself is very delicate and tough, and rarely pilling. Some clothes with poor quality will pilling because the fibers inside will break, and these tiny fibers will run out of the fabric and finally knead into a ball.