From the Davines website: "Smoothing anti frizz serum, it provides thermal protection and control facilitating straightening. Its lightweight and creamy texture protects the hair from heat and makes the styling easier without leaving any residue."
From Rachel: While most heat protectants only protect up to 250 degrees (think a Dyson blowdryer), this beauty protects up to 450 degrees (think every other hairdryer and flat iron). If you are using heat every day, this product is a must!