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. Use conditioner and mask only in the lengths. Our products contain gentle ingredients with substances that nourish your hair and scalp, are free of sulfates, parabens, benzene and cyclic silicones and are 100% vegan.