Olaplex No.9 Bond Protector Nourishing Hair Serum is a weightless, silicone-free formula designed to shield your hair from daily damage. Infused with antioxidant-rich Red Algae Extract and patented Bond Building Technology, this serum acts as an invisible shield against pollution for up to 48 hours and provides heat protection up to 230°C. It helps neutralize free radicals, prevents tangles, reduces static, and adds a satin-like shine, making your hair easier to manage, softer, and healthier with every use.