Sisley Research dedicates its expertise in skincare to haircare based on two observations. The composition and function of the cells in the skin and the scalp are very similar. The factors harming the beauty of your skin (stress, fatigue, pollution, genetic aging, etc.) are the same ones that damage hair. The HAIR RITUEL by Sisley hair care routine…A global approach. Stimulate the scalp, where the hair grows, while restructuring the hair fiber.