The Bond Protector Nourishing Hair Serum N° 9 by OLAPLEX is a true hair hero when it comes to protecting your tresses against daily damage. Pollution and heat damage can lead to hair that is limp, tangled or prone to poor style retention. This leave-in hair serum provides 48 hours of protection against the effects of pollution and heat damage (up to 232°C) without weighing it down. Furthermore, the serum enhances shine and suppleness whilst detangling it and counteracting static.