Heat damage goes deeper than you think—all the way into hair's innermost cortex (where vibrancy, shine, and strength all start). Traditional heat protectants only coat hair's outer cuticle which can lead to damage, color fade, and hair that gets duller with every blow dry. 

That's where HeatBounce comes in with deeper heat protection than ever before*. HeatBounce conditioning heat protectant goes where no heat protectant has gone before with patented technology inspired by the resilience of nature. 

“HeatBounce reflects our commitment to pushing the boundaries of hair science," said Suveen Sahib, co-founder and CEO of K18. "Powered by our patented resilicore™ technology, it delivers intelligent heat protection that penetrates deep into the hair fiber—reinforcing inner bonds and preserving strength by dynamically responding to heat. It's a true breakthrough and the perfect complement to our molecular repair innovation.”

deeper heat protection than ever before*

HeatBounce is a leave-in conditioning heat protectant that penetrates hair’s innermost layers, bouncing away heat up to 450° F (232° C) from cuticle to cortex—as deep as heat damage goes. This lightweight spray holds up against the hottest tools to keep all hair types + textures (even extensions) soft, bouncy, and vibrant. 

The results? 85% less breakage after blow drying* and stronger hair with continued use*.

powered by patented tech 

When approaching how to solve heat damage (as always) the K18 lab first turned to biology. Patented resilicore™ heat-shielding technology is inspired by resilient proteins found in nature that can withstand extreme temperatures and recreated in the lab to be vegan, sustainable, and cruelty-free.

The size + molecular makeup of resilicore™ allows it to penetrate deeper than ever before*, forming a protective shield that fortifies from within, unlike traditional heat protectants that only coat hair’s cuticle.

HeatBounce vs. traditional heat protectants

Traditional heat protectants sit on of hair’s outer cuticle. However, the cortex (one of the innermost layers of the hair) is where heat damage impacts hair’s integrity and strength most.

The cortex is where hair’s vital protein structures exist, where dye molecules bind to, and where breakage begins. It needs to be effectively protected to stop heat damage and the color fade, frizz, dullness, breakage, split ends it leads to.

That means long-term hair health is compromised every time you apply heat without adequate protection. With HeatBounce, hair gets healthier and stronger with continued use*.

soft, bouncy, vibrant hair through every heat style

Whether you opt for a silk press, blowout, curling wand, flat iron, or a quick blast with the diffuser—heat is heat. For healthy hair, you need protection through every heat style.