HeatBounce Conditioning Heat Protectant

The HeatBounce Conditioning Heat Protectant by K18 is a leave-in thermal protector that combines next-generation heat defence with genuine conditioning performance, keeping hair strong, soft and shiny through every blow dry and hot tool session.

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Leave-in conditioning heat protectant powered by patented resilicore™ technology

HeatBounce sets a new standard for heat protection, going further than any traditional heat protectant has gone before.

While conventional formulas form a surface barrier on the outer cuticle layer, K18's patented resilicore™ technology, inspired by natural proteins engineered by nature to withstand extreme temperatures, penetrates into the hair's inner cortex, where heat damage actually occurs, forming a deep protective shield that fortifies from within.

This unprecedented depth of protection, active up to 450°F (232°C), is paired with a conditioning blend that detangles, softens and smooths even the most damaged hair without weighing it down or leaving any coating.

The lightweight, versatile formula of Heatbounce spray is suitable for all hair types and textures, including extensions. Applied on damp hair before blow drying and on dry hair before hot tools.

The hair benefits of a deep-penetrating conditioning heat protectant

• Deep cortex protection: resilicore™ technology reaches into the hair's inner cortex, the actual site of heat damage, forming a protective shield from within, rather than just coating the surface.
• Dramatically less breakage: the hair fibre is strengthened from the inside out, building resilience against the mechanical and thermal stress of blow drying and heat styling.
• Colour preservation: protein stability within the hair fibre is maintained under heat exposure, helping to prevent colour fade and pigment alteration.
• Conditioning and detangling: the formula instantly softens, eases detangling and improves manageability, even on damaged hair, with no residue and no heaviness.
• Lightweight and universal: a weightless texture that works across all hair types and textures, including fine hair and extensions.

Clinically proven results from the K18 HeatBounce Heat Protectant*

• 85% less breakage after blow drying.

Key ingredients

• resilicore™ – a patented peptide complex inspired by nature's most heat-resilient proteins, engineered to penetrate into the hair cortex and form a deep thermal shield where heat damage actually occurs — going further than any surface-coating protectant
• Hydrolysed barley protein – a hair-compatible protein that reinforces fibre resilience, improves elasticity and eases detangling
• Sunflower – a lightweight, non-greasy plant oil that nourishes and protects the hair fibre while enhancing shine and softness
• Rice bran – an antioxidant-rich active that strengthens hair resilience and shields against environmental aggressors
• Rosemary – a botanical antioxidant that supports hair vitality and protects the fibre from oxidative stress induced by heat and UV exposure
• Tocopherol – vitamin E that neutralises free radicals and preserves the structural integrity of the hair fibre

Clean leave-in conditioning heat protectant for all hair types and textures, including colour-treated, damaged hair and extensions.

*Reduction in hair breakage observed in clinical testing after application of HeatBounce and use of high heat blow dry on wet hair.

How to use the K18 HeatBounce Conditioning Heat Protectant

Apply throughout sectioned, towel-dried hair before blow drying, brushing through for even distribution.

Less is more : start with a small amount and build as needed. Hair should feel soft and tangle-free, not coated.

Reapply to dry hair before using any hot tools. Safe to use at every wash and before every heat styling session.