Acrylic fiber is an excellent insulator with low hygroscopicity. In winter, the relative humidity of air is low, and the conductivity between air and human body is poor. Therefore, when we wear clothes made of acrylic fiber, it will cause friction with the activities of the body. The charge load generated by friction is difficult to flow and transfer on acrylic clothes, so the so-called static electricity is formed. The more friction, the more charge is accumulated.