Full Thickening Mousse is designed for flat, lifeless hair. This ultra-lightweight formula features breakthrough Poly Beta Amino Ester-1, a new technology invented by Living proof® scientists that deposits 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. It also contains just the right amount of flexible hold to help keep your style in place. Safe and effective on colored hair, too.