According to the statistics of the International Organization for the Protection of Animals, 8 million pieces of animal fur are traded in the world every year, and there are more than 30 million fur producing animals in animal farms around the world. Because of the need for fur, there are also many kinds of artificial fur in production.

The fur of animal fur is generally divided into two or three types. The bottom layer is fluff, thin and light, but the output is low and the price is high; The upper layer is bristle, and the color of fur usually comes from bristle. Some animals also have middle layer hair. If the hair is removed and turned into leather, such as sheepskin, leather is more commonly used as a shoe material and can also be used to make clothes.