OLAPLEX No. 9 Bond Protector Nourishing Hair Serum is a lightweight, nourishing serum designed to protect hair from environmental stressors while providing deep hydration and strengthening benefits. Formulated with OLAPLEX's patented Bond Building technology, this serum helps to shield hair from pollution, UV rays, and free radicals, preventing damage and breakage. Offers Heat protection up to 450ºF (232ºC) against styling tools, helping to prevent damage and provide a satin shine finish. It smooths and detangles hair, leaving it soft, shiny, and frizz-free. Ideal for all hair types, this serum provides long-lasting protection, enhances manageability, and supports healthier-looking hair with each use.