This shampoo is specially formulated to work with blond or lightnened hair extensions. Ever wonder what products the hair manufacturers use to keep the hair in such great condition? So did we, so we got the factory to provide us with the same products they use to keep the extensions in that "fresh out of the pack" state. This shampoo, along with the conditioner, are specially formulated to keep your blond or lightened extensions, soft, strong, and healthy.