The Joico Defy Damage Protective Shield is a leave-in treatment designed to guard against the effects of daily heat styling, UV exposure & environmental pollution that can lead to dull, lacklustre locks. Building a defence against daily aggressors, the pre-styling formula helps to prevent damage & colour fading, working tirelessly to maintain vibrant, healthy-looking locks. Hair is 4x more resistant* to breakage during heat styling & is left feeling soft, shiny & fortified. * Against combing breakage on clean, damaged hair.