Olaplex No. 9 Bond Protector Nourishing Hair Serum is a leave-in styling serum scientifically proven to protect hair from pollution for 48 hours. This antioxidant-rich, silicone-free serum improves manageability, smoothes and protects all hair types for immediate results. Pollution damages hair leaving it dull and lifeless, ultimately resulting in broken bonds. It uses an antioxidant Red Algae extract and a film-forming polymer to neutralize free radicals and UVA/UVB, shield against pollution, guard hair from breakage and protect against heat styling up to 450° Fahrenheit. Infused with OLAPLEX’s multi-patented bond building technology, the active ingredients work to nourish, repair existing damage and protect from future damage.