Design Essentials Silk Essentials Thermal Strengthening Serum delivers professional-grade protection and nourishment for heat-styled hair. This 4oz formula combines silk proteins with strengthening botanicals to shield strands from thermal damage while enhancing elasticity and shine. Ideal for frequent blow-dry and flat iron users, it creates a protective barrier that reduces breakage and frizz. Apply to damp hair before styling for optimal results. A lightweight, non-greasy serum that works across all hair types to restore resilience and maintain healthy-looking locks.