Biolage ColorLast shampoo and conditioner duo 33.8 oz. Bottles are sealed and unopened. This shampoo and conditioner duo not only preserves the hue of dyed locks, but also repairs any damage to the hair. The shampoo gently cleanses the locks while the conditioner detangles and shines. Both items are paraben free and have a low pH. When used together, they can keep hair color looking vibrant for up to nine weeks. This shampoo and conditioner duo: - Cleanses to prevent stripping of color - Prolongs and maintains color depth, tone, and shine - Leaves hair feeling soft and looking vibrant