This leave-in conditioning heat protectant detangles, softens, and delivers deeper heat protection than ever before for 85% less breakage after blow drying.resilicore heat-shielding technology is inspired by proteins in nature that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the cuticle, the size + molecular makeup of resilicore allows it to penetrate deeper than ever before, into hair's inner cortex where heat damage can occur, forming a protective shield that fortifies from within.Conditioning blend conditions, softens, and detangles even damaged hair. Created for all hair types + textures. Can be used on extensions.Protects from heat up to 450°F85% less breakage after blow drying⁷Lightweight formula conditions, softens, and detangles even damaged hair*Heat protection observed on hair in clinical testing after application of HeatBounce and use of 450°F (232°C) flat iron on dry hair. ¹Results observed as a reduction in hair breakage in scientific testing after application of HeatBounce and use of 450°F (232°C) flat iron on dry hair. ²Results observed as an increase in protein stability in scientific testing after application of HeatBounce on d hair and exposure to 450°F (232°C) flat iron on dry hair. ³Results observed as a reduction in color change in scientific testing after application of HeatBounce on dry hair and use of 450°F (232°C) flat iron. ⁴Results observed as a reduction in hair breakage in scientific testing after application of HeatBounce on dry hair and use of 450°F (232°C) flat iron. ⁵Results observed as a reduction in hair breakage in scientific testing after application of HeatBounce on dry hair and use of 450°F (232°C) flat iron. ⁶Results observed as an increase in protein stability in scientific testing after repeated exposure to UV and HeatBounce application. ⁷Reduction in hair breakage observed in clinical testing after application of high heat blow dry on wet hair.