Generally, PU skin will age and peel after 3 to 5 years. Pu leather is artificial leather, which is easy to age. If it is not properly maintained, it will peel off after 3 to 5 years of use. If properly maintained, it will last longer. Pu leather is short for superfine fiber leather. PU leather is an artificial imitation leather. PU is also a polymer compound, which is formed by the reaction of isocyanate and hydroxyl. Because of its elasticity, flexibility and good air permeability, it is widely used to make shoes and other clothes. PU leather is high in strength, thin and elastic, soft and smooth, good in air permeability and water permeability, waterproof, good in tensile strength and buckling strength at low temperature, good in photoaging and hydrolysis stability, strong in wear resistance, close to natural leather in appearance and performance, easy to wash and stain, easy to sew, smooth and compact in surface, and can be subjected to various surface treatments and dyeing, with various varieties.