L’Oreal Paris Extraordinary Oil Lustrous Oil Serum leave-in hair treatment hydrates and nourishes to transform dry, lifeless hair into soft and lustrous. Infused with flower oils, the treatment leaves hair that is sumptuously soft, lightweight, and brilliantly shiny in just one wash*. For best results, use Extraordinary Oil Lustrous Oil Serum treatment with L'Oreal Paris Extraordinary Oil shampoo and conditioner.