What it is: A leave-in conditioner with Resilicore technology that detangles, softens, and intensely protects hair up to 450°F. Hair Texture: Straight, Wavy, Curly, and Coily. Hair Type: Fine, Medium, and Thick. Hair Concerns: - UV Protection. - Heat Protection. - Shine. Key Benefits: - Protects from heat up to 450°F. - 85 percent less breakage after blow-drying. - Lightweight formula conditions, softens, and detangles even damaged hair. Highlighted Ingredients: - Resilicore Heat-Shielding Technology: Patented tech for heat protection from cuticle to cortex—more intense than ever. What Else You Need to Know: Resilicore heat-shielding technology is a breakthrough innovation inspired by resilin—a natural protein that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the cuticle, the size and molecular makeup of Resilicore allows it to penetrate deeper than ever before, into the cortex where heat damage can occur, forming a protective shield that fortifies from within. This formula was created for all hair types and textures and can be used on extensions. Clinical Results: In scientific testing with application of K18 HeatBounce and use of 450°F (232°C) flat iron on dry hair: - Reduction in hair breakage. - Heat protection up to 450°F/232°C from the cuticle to cortex. In scientific testing after application HeatBounce on damp hair and exposure to 450°F (232°C) flat iron on dry hair: - Increase in protein stability. - Heat protection up to 450°F/232°C from the cuticle to cortex. In scientific testing after application of high-heat blow-dry: - Reduction in hair breakage. - 85% less breakage. Clean at Sephora. Clean at Sephora is our commitment to offering effective products without certain ingredients, such as parabens, sulfates, phthalates, and mineral oils. Learn more here - https://www.sephora.com/beauty/clean-planet-aware. Size: 4 FL Oz. Color: None. Gender: unisex. Age Group: adult.