WHAT IT IS A volumizing leave-on treatment that contains antioxidants and botanicals that help provide a rejuvenated scalp environment. For noticeably thin fine chemically treated hair. WHAT IT DOES Scalp and Hair Care System 4 Scalp Treatment rejuvenates and purifies hair of residues to provide fuller-looking healthy hair. SPF-15 sunscreen helps provide sun protection for the scalp while lightweight conditioners help provide thicker looking hair by increasing the fullness of each hair strand.