What It Is:This moisturizing leave-in provides instant results and continuous repair and protection from cortex to cuticle. No. 5 Leave-In immediately seals split ends and promotes visibly healthier hair after one use. Go beyond hydration with Olaplex Bond Building Technology and High-Adhesion Sealing Complex.What It Does:- Instantly hydrates, softens and detangles.- Immediately seals split ends.- Continuously repairs and protects.- Revives hair health, leaving it softer, hydrated and healthier looking.- Heat protection up to 450F.- Color safe.Key Ingredients:- High-Adhesion Sealing Complex immediately and continuously mends split ends.- Hydramino Replenishing Blend provides hydration, conditioning, detangling and shine.- Future Damage Shield helps repair and prevent damage from styling and heat up to 450F.- Olaplex Bond Building Technology re-links the disulfide bonds that give hair its strength and structure.How To Use It:- Apply 1-2 pumps to clean, damp hair. For fine hair, begin with 1 pump. For medium to coarse hair, begin with 2 pumps. Add more as needed.- Follow with your preferred stylers.Clinical Results:- 12x more moisture after one use.*- Up to 88% split-end sealing after one use.*- Reduces breakage by 81%.**As tested in a clinical facility using curly tresses.