Kérastase Blond Absolu Recovery Overnight Hair Serum - 90mlKrastase Blond Absolu Night Serum 90ml is a hair serum designed to restore and protect blonde hair while you sleep, leaving it softer, smoother, and less frizzy. This lightweight serum is formulated with hyaluronic acid to provide deep hydration and antioxidants to protect hair from damage caused by bleaching and highlighting. It also helps to reduce frizz, soften and smooth hair, and prevent breakage and split ends.