Infusium 23 volumologie hair shampoo, step 1 cleanses to remove residue and build-up while nourishing hair from root to tip. Specially designed with our unique i23 essential treatment complex, (volum)ologie shampoo helps boost and enliven fine, thin hair that has become flat and unresponsive. Infusium 23 has combined decades of knowledge and experience with scientific advances to create (volum)ologie shampoo. Infusium 23 offers specialized hair care solutions that are proven to enhance the texture and condition of your hair.