HeatBounce Leave-In Conditioning Heat Protectant Spray - 4 oz

Get ready to turn up the heat without torching your strands, because the future of damage-free styling is here with the K18 Biomimetic Hairscience HeatBounce Leave-In Conditioning Heat Protectant. Unlike those traditional formulas that just sit on the hair's surface, this overachieving protectant is powered by our patented resilicore™ heat-shielding technology that actually penetrates deep into the hair's innermost cortex. This is major, because the cortex is where hair's strength and color vibrancy live, and it’s where heat damage truly begins to compromise the integrity of your hair fiber. Now you can confidently reach for your blow dryer, flat iron, or curling wand, knowing that your hair is shielded up to a massive 450∘F (232 C) from the cuticle to the cortex.

The HeatBounce spray is so much more than a simple heat barrier; it's a powerful conditioning treatment dressed up in a lightweight, non-greasy formula that won't weigh down even the finest hair. This leave-in wonder effortlessly detangles hair right after a wash, smoothing the cuticle and helping to regulate lasting moisture balance for hair that feels incredibly soft, manageable, and bouncy. We’re talking about scientifically proven results, like a stunning 85% less breakage after blow drying. This means your color stays truer for longer, your blowouts are dramatically smoother, and you can kiss those dull, scorched-feeling strands goodbye—it’s honestly the perfect foundation for easier, healthier styling, every single time.

No matter your hair type or texture—whether you have fine hair, thick curls, or even extensions—this versatile formula is your new styling essential. It’s a true dual-use powerhouse, designed to be applied on towel-dried hair before you blow dry, and then reapplied on dry hair right before you hit it with your hot tools. Just remember, because the formula is highly concentrated and effective, less is definitely more—start small and build as needed, ensuring your hair feels soft and tangle-free, but never heavy or coated. Go ahead, turn on the heat—your healthiest, most vibrant hair is now fully protected, from the inside out.