Kerastase Resistance Bain Extentioniste Shampoo For Longer Hair – 250mlKerastases Extentioniste Shampoo works to strength lengths to create an optimal environment for hair to grow long. This mask can be used as a deep treatment to replenish your hairs integrity. Increases elasticity & strength from root to tip Rebuilds natural strength of the hair fiber Purifies and stimulates a healthy scalp environment Benefit Improves resistance of the core of hair fiber and improves the root environment. Protects the internal bonds