Olaplex No. 9 Bond Protector Nourishing Hair Serum – 3oz – Shield your strands from daily damage with this weightless, antioxidant-rich serum. Olaplex No. 9 protects against heat, pollution, and breakage while boosting shine, softness, and style memory. Powered by Bond Building Technology™, it nourishes and defends all hair types—leaving hair smooth, strong, and protected from root to tip.