Kerastase Résistance Extentioniste Length Strengthening Blow-Dry Primer seals split ends and protects your hair from heat damage, ensuring healthy, strong lengths.Kerastase Résistance Extentioniste Blow-Dry Primer is designed to protect and strengthen your hair during heat styling. This smooth gel cream features Glaçage Thermo-Ceal, Creatine R, and Taurine, which work together to instantly seal and resurface the hair fibre. It reduces hair breakage by 93% after just one use and protects your hair from heat up to 230°C. Ideal for anyone who frequently uses heat styling tools, this primer ensures your hair stays strong, resistant, and can grow longer while remaining healthy. Protects up to 230°C. Rebuilds and strengthens hair fibre. Reduces breakage by 93%. Seals split ends instantly.