CHI Infusion is specifically developed to work in conjunction with the CHI line. CHI Infusion with Cationic Hydrating Interlink is a rich leave-in treatment enriched with pure silk along with wheat and soy proteins that will penetrate and help in strengthening the hair, while providing incredible softness, manageability and shine without build-up. Paraben Free. Offers superior thermal protection from the inside out for all hair types. Weightless formula. No build up. Helps strengthen and protect the hair from daily use of thermal tools. Paraben Free.