ColorTek Professional Color Refresher Hair Repair Treatment 7.1oz repairs damage on all levels of the hair shaft: cuticle, cortez and medulla. Creates more vibrant colors with a complex of wheat germ oil, panthenol, and wehat and silk amino acids. Aids in preventing split ends and decreases drying time. Enhances and illuminates hair color with Optical Brighteners. Sulfate Free Designed with Bio-nanotechnology Color Refresher Hair Repair is instantly absorbed to restore strength to the hair cortex, creating a smooth healthy sheen for beautiful looking hair.