OLAPLEX No. 9 Bond Protector Nourishing Hair Serum is a leave-in, silicone-free hair serum to shield from pollution and heat that cause tangles, breakage, and static. OLAPLEX Bond Building Technology™ is paired with potent, antioxidant-rich Red Algae Extract to nourish hair, block pollutants, and neutralize free radicals. See satin shine, style memory, bounceback curls, anti-tangle and anti-static action, and heat protection up to 450°F. For all hair types.