Bosley defense starter pack for normal/fine and color-treated hair contains nourishing shampoo, volumizing conditioner, and thickening treatment. The nourishing shampoo cleanses and removes toxins such as D.H.T. from the hair and scalp skin, a primary cause of hair thinning and hair loss and helps to extend the longevity of hair color. Its volumizing conditioner infuses weightless body and shine onto the hair and scalp while adding thickness and volume as it fortifies the hair shaft. The thickening treatment creates thicker feeling hair while helping to inhibit the action of DHT, protect and repair hair follicles and help support healthy hair function.