Nutritive range from Kérastase strengthens and nourishes dry and sensitized hair. This serum treats hair overnight by repairing and providing essential moisturizing nutrients for healthy-looking hair. In the morning, hair is smooth, silky and regenerated. Details: FEATURES: Night hair serum Nourishes dry hair 8 hours of overnight nourishment Easier detangling Increases manageability Makes hair supple and shiny Enriched with Iris Root extract and a blend of five vitamins including vitamin E Seals cuticles HOW TO USE: Use 2 to 4 pumps on lengths and ends Let sit overnight Do not rinse