Leave-In is an alcohol-free, leave-in volumizer that provides thermal protection to resist heat and humidity. The weightless volumizer nourishes the hair and is great for all hair types. Get thicker, fuller-looking hair with Bosley Volumizing and Thickening Nourishing Leave-In. The leave-in treatment contains ColorKeeper to protect and extend the life of hair color. Bosley Volumizing and Thickening Nourishing Leave-In detangles the hair and keeps it smooth while promoting healthy hair growth. LifeXtend Complex nourishes and strengthens hair for a thicker, fuller look.