Improves condition of naturally curly or wavy hair. Why use ThermaSilk Curl Defining Conditioner? The heat of the blow dry works with the conditioner to help create smooth, defined curls. The only conditioner with Heat-Activated moisturizers to reduce frizz. Keeps curls hydrated without weighing down hair. Makes hair 5x more manageable. What Does Heat-Activated Mean? The ThermaSilk heat-activated moisturizers help lock in your hair's moisture that can be lost during heat styling - transforming a dull, lifeless texture into softer, silkier hair.