Instantly conditions and hydrates hair while adding volume and body. Biosilk 17 Miracle Leave-In Conditioner revitalizes dull hair, strengthening and repairing it. It defines curls, smoothes the cuticle, and prevents split ends. Biosilk 17 Miracle Leave-In Conditioner is a miracle because it seems to solve all your problems. It has multiple functions: Instantly conditions and hydrates, Adds volume and body, Defines curls, Repairs dry/damaged hair, Strengthens hair, Smoothes the cuticle and prevents split ends, Controls frizz, Protects against color fading, Protects against environmental damage, Provides thermal protection, Adds shine.