Paul Mitchell Heat Seal is a multi-purpose humidity resisitant styling spray. It helps to protect hair from damage caused by hair dryers, irons, and tongs. Heat Seal increases body and enhances shine. It’s humidity resistant, ensuring longer lasting hairstyle, whether it’s curly or straight. It’s suitable for all hair types. Please note heat is needed for activation. Directions of use: Towel dry your hair. Apply liberally. Comb through. Blow dry or set as desired.