The characteristics of PU are: good physical properties, resistance to twists and turns, good softness, high tensile strength, and permeability. The pattern of PU fabric is first pressed on the surface of semi-finished leather with a pattern paper, and then separated the paper leather after cooling down to do surface treatment. High permeability, temperature permeability can reach 8000-14000g/24h/cm2, high peeling strength, high water pressure resistance, is the ideal material for waterproof breathable clothing fabric surface layer and bottom layer. The service cycle of the pattern roller is long.