This overnight leave-in Kérastase 8H Magic Night Serum gives a nourishing boost to all hair types. Infused with Iris Root extract and a blend of 5 vitamins including vitamin E, the serum deeply penetrates the fiber over 8 hours for 100% absorption to restore hair's balanced nutrition levels. Use 2-4 pumps, apply on length and ends before going to bed. And voila! You’ll wake up with visible soft and smooth hair.