Treat hair to the nourishing properties of Kérastase Nutritive Night Repair, an eight-hour magic serum to help condition and replenish dry hair. Working through the night while you sleep, the non-greasy hair serum delivers intensive overnight nourishment, blending Iris Root extract with a cocktail of five essential vitamins to leave hair feeling lightweight and luxuriously nourished with long-lasting effect. The intensive overnight treatment has a beautiful fragrance designed to develop while you sleep. No need to rinse out in the morning.