Olaplex No.9 Bond Protector Nourishing Hair Serum - 90ml For all hair types and textures Olaplex No.9 Bond Protector Nourishing Hair Serum is an anti-damage hair shield that protects your hair from daily damage. Protects 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. Benefits Satin shine & softness Style memory & bounceback curls Anti-tangle & anti-static Free of DEA, Aldehydes and Formaldehyde Use As the first step in your styling routine, apply a small amount to damp hair working upward from ends to roots. Use more as needed for longer, thicker hair. Use on days you wash your hair and any days in between for added protection.