Shield your strands while styling. Kérastase Genesis Défense Thermique Spray is a nourishing heat-protectant designed to strengthen and smooth weakened hair. Enriched with Edelweiss Native Cells and Ginger Root, it defends against breakage, frizz, and heat damage up to 220°C. Hair feels softer, silkier, and more resilient, ready for any blow-dry or heat styling routine.