Bain de Terre Magnolia Thermal Iron Protector Bain de Terre Magnolia Thermal Iron Protector is an aerosol 24-hour humidity blocker that protects against heat up to 450°. Features a fine-mist spray that conditions, protects and provides a light hold. A powerful combination of silicones and amino acids including the moisture-rich Marula oil, provide conditioning benefits while imparting shine and softness to the hair. Ideal for all hair types. Directions: Apply to clean, damp hair and style as desired.