OLAPLEX No.9 Bond Protector Hair Serum is a lightweight, leave-in treatment that provides 48-hour pollution protection and heat protection up to 450°F. This silicone-free formula features antioxidant-rich red algae extract and OLAPLEX's Bond Building Technology to protect and nourish all hair types. Key features: • 48-hour pollution protection • Heat protection up to 450°F/232°C • Silicone-free formula • Enhances shine and softness • Improves style retention • Anti-static and anti-tangle properties • Suitable for all hair types Apply a small amount to damp hair, working from ends to roots as the first step in your styling routine. Use more product as needed for longer or thicker hair. Can be used on wash days and between washes for continuous protection. The formula contains red algae extract and OLAPLEX's patented Bond Building Technology to help maintain healthy-looking hair while protecting from environmental damage.