Olaplex No.9 Bond Protector Nourishing Hair Serum 90ml. Seeing dull hair, tangles, or poor style retention?. These could be signs of pollution or heat damage. Protect your hair from daily damage with this weightless, leave-in, silicone-free hair serum to shield hair from pollution for 48 hours and provide heat protection up to 450°F (232°C).With antioxidant-rich Red Algae Extract and scientifically proven OLAPLEX® Bond Building Technology.• Satin shine & softness• Style memory & bounceback curls• Anti-tangle & anti-static