Olaplex Nº.9 Bond Protector Nourishing Hair Serum is an antioxidant-rich protective treatment designed for all hair types. This innovative serum utilizes bond-building technology to protect hair from damage while improving manageability and providing nourishing benefits. Key features: • Antioxidant-rich formula • Protects hair from environmental damage • Improves hair manageability • Suitable for all hair types • Features bond-building technology • Lightweight serum texture This 90ml/3.0 fl. oz serum can be applied to both damp or dry hair for ongoing protection throughout the day. The formula works to shield strands while simultaneously softening and smoothing the hair. For best results, apply a small amount to clean, towel-dried hair before styling. The serum integrates Olaplex's patented bond-building technology to help maintain hair health and prevent damage.