Strengthen hair from the inside out with K?rastase Resistance Bain Extentioniste, a fortifying shampoo that uses powerful amino acids and ceramides to improve elasticity from root to tip. Apply a quarter size amount of Bain Extentioniste shampoo to wet hair. Massage through lengths and ends until lathered and rinse thoroughly. Suitable for weak hair types. Targeting weakened and brittle strands, the silky formula helps to rebuild the hair?s internal structure to make it more resistant to breakage, whilst a blend of lipids creates a smooth and shiny surface. The shampoo gently lifts away the build-up of dirt, impurities and excess oil from the scalp to leave locks fresh, clean and strong.