OLAPLEX No.9 Bond Protector Nourishing Hair Serum is the perfect protector. If your hair is looking dull, prone to tangles and has poor style retention, you might be suffering from heat damage or pollution. Protect your hair with this weightless leave-in, silicone-free hair serum designed for 48-hour protection against pollution and heat protection up to 450°F/232°C. Formulated with OLAPLEX Bond Building Technology and antioxidant-rich Red Algae, your hair will be shinier, softer and frizz-free while protected from damage. Red Algae bonds to wet hair like an invisible shield to block pollutants, nourish the hair and neutralize free radicals before they cause damage.