the therapist hydrating shampoo contains sulfate-free cleansers to gently clean hair while enhancing its manageability. this hydrating shampoo contains glycerin to deliver moisture to the cuticle, helping to minimise frizz and reduce the impact of humidity. hydrolyzed quinoa works to strengthen and protect the hair fibre while helping retain colour. the therapist hydrating shampoo is part of the hydrate family, designed to hydrate dry, colour-treated hair.