Eugène Perma Professionnel Curless Keratin Elixir Prolonger is a leave-in treatment designed to prolong the effects of keratin smoothing treatments. This elixir helps to maintain hair's smoothness, shine, and manageability between salon visits. Formulated to protect hair from humidity and frizz, it enriches the hair fiber with keratin and other nourishing ingredients. The lightweight formula absorbs easily, leaving hair feeling soft and looking revitalized without weighing it down. Ideal for use on straightened or color-treated hair, it is your daily ally for maintaining perfect, salon-fresh results.