This shiny creamy formula contains Pro Xylene, Lancome's exclusive ingredient that nourishes the lips. Colorless and smooth, this gentle and relaxing balm can be used day or night, or under your pet's lip color. It is a base for moisturizing transparent lips and protection. Thanks to the pro-Xylene formula, it provides deep moisturizing of the lips for 6 hours. After more than seven years of advanced research, the Lancome formula contains the patented Pro Xylene molecule to identify and embody the lip liner.