Kerastase Resistance Bain Extentioniste was created to strengthen slow-growing damaged lengths. This fortifying shampoo consists of powerful amino acids and ceramides to strengthen the internal structure of the hair and improve elasticity from root to tip. Kerastase Bain Extentioniste's silky formula gently removes build-up, impurities, and excess oil from the scalp to leave the hair well-protected, fresh, and strong with a visibly healthy look and natural shine.