Every conventional heat protectant does the same thing: lays a coating over the outside of the hair. The problem is that a 450°F flat iron doesn't stay on the outside. Heat travels into the cortex, where it destabilizes the proteins that hold hair together — and that's where the dryness, dullness, color fade and breakage actually begin.
HeatBounce is built around resilicore™, a heat-shielding technology inspired by resilin, a protein found in nature that withstands extreme temperatures. Its molecular size lets it move past the cuticle and into the cortex, where it forms a shield that fortifies the strand from inside.
Clinically proven
- 85% less breakage after blow drying*
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450°F / 232°C protection, from cuticle through to cortex
- Helps guard against color fade, dryness and dullness — not just breakage
It's also a leave-in conditioner
The formula conditions, softens and detangles as it protects, so you're not layering three products before you pick up a dryer. Even damaged hair combs through easily. Lightweight enough for fine hair; effective on coarse and textured hair; safe on extensions.
No waiting, no activation
Some protectants need heat to "activate" or time to dry down. This one doesn't. Apply, brush through, start styling immediately.
Best for
Anyone who blow-dries, straightens, curls or waves — daily or occasionally. Color-treated, bleached, fine, coarse, curly and coily hair. All hair types and textures, extensions included.
How to use
- Section the hair and apply throughout, brushing through so it distributes evenly.
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Less is more. Start small and build. Hair should feel soft and tangle-free — not coated.
- Use on towel-dried hair before blow drying, and on dry hair before hot tools.
- Reapply every time you add heat, including when you switch from blow dryer to iron.
Where it fits in the routine: shampoo → K18 mask (4 minutes) or DAMAGE SHIELD conditioner → HeatBounce → blow dry or air dry → HeatBounce again before hot tools → K18 oil to finish.
FAQ
Does it need heat to activate?
No. It protects from the moment it's applied.
Do I have to wait before styling?
No. Blow dry or use hot tools straight away.
How is this different from the K18 hair oil?
The oil gives conventional heat protection on the outer layers, plus molecular damage repair. HeatBounce defends from the cuticle all the way into the cortex — deeper, and specifically targeted at heat. Many people use both: HeatBounce before heat, oil as a finisher.
How often should I reapply?
Every time heat touches the hair. If you blow dry and then straighten, that's two applications.
Will it weigh fine hair down?
Not if you're light-handed. Fine-haired reviewers consistently rate it well, with the same caveat: start with a small amount.
Can I use it on extensions?
Yes.
Ingredients
Water (Aqua) (Eau), Cellulose Gum, Isopentyldiol, Propanediol, Cetearyl Alcohol, Isopropyl Palmitate, Sodium Benzoate, C13-15 Alkane, sh-Oligopeptide-78 s-Fruit Fly Oligopeptide-1 Peptides, Laurdimonium Hydroxypropyl Hydrolyzed Barley Protein, Helianthus Annuus (Sunflower) Seed Oil, Oryza Sativa (Rice) Bran Extract, Helianthus Annuus (Sunflower) Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Tocopherol, Behentrimonium Chloride, Brassicatrimonium Chloride, Gluconolactone, Arginine, Coco-Glucoside, Lactic Acid, Cellulose, C12-20 Alkyl Glucoside, Citric Acid, Potassium Sorbate, Benzyl Alcohol, Isopropyl Alcohol, C14-22 Alcohols, Fragrance (Parfum), Amyl Salicylate, Benzyl Salicylate, Citronellol, Citrus Aurantium Peel Oil, Dimethyl Phenethyl Acetate, Geraniol, Geranyl Acetate, Isoeugenyl Acetate, Limonene, Linalool, Linalyl Acetate, Pinene, Tetramethyl Acetyloctahydronaphthalenes, Vanillin.
*Reduction in hair breakage observed in clinical testing after high-heat blow drying on wet hair. Heat protection observed in clinical testing at 450°F (232°C). Cruelty-free (Leaping Bunny certified).
