Lanza Keratin Healing Oil Hair Plumper fattens skinny hair strands and gives hair a bold, robust appearance. This revolutionary hair plumper bulks up hair without weighing it down and delivers fullness and density. Lanza Keratin Healing Oil Hair Plumper defines and separates and gives hair an added dimension with an internal bounce. Hair Plumper delivers a flexible support. and has a natural hold of 4. Can be used on both dry and damp hair.