Defend your hair from the inside out with K18 Damage Shield HeatBounce, a revolutionary lightweight spray that combines leave-in conditioning with high-performance thermal protection. Engineered with advanced biotechnology, this dual-action formula shields hair against heat up to 450°F (232°C) while nourishing and detangling without weighing strands down. Experience extreme heat defense that prevents dryness and breakage from blow-drying, flat irons, and curling wands. The formula smooths the hair cuticle and blocks humidity for up to 48 hours of frizz control, keeping your style sleek and polished. Biotech-powered polymers and botanical extracts strengthen your hair's natural barrier while protecting against environmental aggressors and UV rays. This weightless conditioning spray makes combing through wet hair effortless, reducing mechanical damage during styling. The pH-balanced formula keeps the hair cuticle closed for maximum smoothness and shine. Color-safe and clinically tested, it's gentle on color-treated hair while maintaining vibrancy. Apply 1-3 sprays to clean, damp hair from roots to ends, comb through, and style as usual. No rinsing required. Perfect as the essential first step in any styling routine. K18 Biomimetic Hairscience | 118 ml / 4 fl oz