Kerastase Resistance Serum Extentioniste Leave-In Treatment for Damaged Hair - 1.7 oz | Repairs & Strengthens | Perfect for Daily Use & Salon Styling

Kerastase's Resistance - Serum Extenioniste Scalp & Hair simulates, soothes, and protects the scalp as well as reduces itchiness to promote longer, healthier hair. This nourishing serum strengthens the hair fiber while making it shinier, more elastic, and more hydrated.