It is the oldest form of fabric in human history. The history can be traced back to at least 6500 BC. It is at least 8,000 years old and belongs to the form of non-woven fabric, which is earlier than textile, knitting and other technologies. Used by humans. The hair has both softness and toughness, good fiber elasticity, comfortable touch and good reducibility. Because the wool felt products are folded, they can quickly return to their original shape and are not easily deformed. In addition, its fiber structure can be tightly entangled, and its tough characteristics do not need to be processed through knitting, sewing, etc., and can be completely integrated.