You mean why ysl air cushion sealing paper fell off? Let it age for a long time. According to the one called Dou Ding. Com, ysl air cushion sealing paper will age and deteriorate if it is left for a long time, which will lead to hardening, embrittlement and even peeling of the sealing paper. YSL, short for YvesSaintlaurent, translated as Saint Laurent in Chinese, is a famous French luxury brand. It was founded by Yves Saint Laurent and was born in Algeria, French North Africa.1August 1966 1936. Mainly including fashion, skin care products, perfume, bags, glasses, accessories and so on.