Full Thickening Mousse is designed for flat, lifeless hair. This ultralightweight formula features Living Proof’s patented molecule, PBAE, a new technology invented by scientists to deposit a flexible, micro-pattern of thickening points on each strand. These thickening points add just the right amount of natural texture to the hair strands to make flat, limp hair look, act and feel like full, thick hair. Because it's a completely flexible technology, it lasts throughout the day without collapsing or becoming stiff and crunchy. Full Mousse also contains just the right amount of flexible hold to help keep your style in place.