This is the classic design, whose model shape makes human back and seat more steady and reliable to reach the comfort during the journey. The sponge of seat back and seat cushion adopt coldly to be once solidified and foamed by shaping technology which can prevent the seat from changing shape due to a long carriage. The curve of seat back is combined with human body engineering design, and satisfies with the comfort requirement to the best. Additionally, the thickness of the backrest is made to be the minimum（＜25mm）to meet the market requirements. When the seat arrangement is 775 mm, the seat can meet the Level II Hight Standard.