Heat Activated Blow Drying Spray adds lightweight shape memory and definition to hair. Heat activated spray that shapes and defines hair. A blow-dry perfector and styling primer add memory and definition to the final look with a light, natural feel. How to use: To unlock the spray tip, press the button that says "unlock". Spray generously on towel-dried hair. Lift roots while blow-drying or roller drying to add volume. Comb the hair with a hot tool to create waves and curls. To close the spray tip, press the button that says "lock".