Flat hair can be caused by several things, such as an oily scalp, too much product residue and inappropriate hair care products. Wash your hair twice with shampoo, and use Volume Infusion in your shampoo (second wash) and conditioner. Only use conditioner and mask on the lengths. Our products contain gentle ingredients with substances that nourish your hair and scalp, are free from sulfates, parabens, benzene and cyclic silicones and are 100% vegan.