Living Proof No Frizz Shampoo. This weightlessly hydrating formula gently cleanses the hair and effectively blocks humidity for truly sleek locks. Its key ingredient, PolyfluoroEster, creates an invisible shield on the hair to lock in moisture-proof smoothness and repel dirt and oil, so you can go longer between washes to break the frizz and damage cycle. Developed for all hair types, sulfate- and silicone-free..