Kiehl"s Since 1851 Hydro-Plumping Re-Texturizing Serum Concentrate utilizes the next generation of Serum-to-Liquid TechnologyTM to intensively hydrate the deepest surface layers of dehydrated skin. It drenches you in moisture immediately upon application, plumping your skin while smoothing the appearance of fine lines and rough texture and treating dull, tired skin.