TRESemmé Thermo Sculpt Memory Priming Hair Serum provides up to 72h style retention*. Powered by Salon Grade Thermo-Activated KeraKinetic Tech, it's the final step in a hair care system that transforms the way hair responds to heat. Activated by heat-styling, crystal-like molecules re-form in the core of the hair, enhancing resilience and the ability to retain style. Check out my feedback and other items, for further multiple purchase postage discounts.