Volume Eyelash Extensions - When one or more lashes are applied to a single natural lash using very thin lashes. If two eyelash extensions are applied to a natural lash, it is called 2D, if three eyelash extensions are applied to a natural lash, it is called 3D, etc. This method is also known as Russian volume. The eyelash extensions used in this method are significantly thinner than the classic method, usually 0.07 in diameter. Volume lashes are lighter, more fluid, and give the client a fuller look. Volume lashes are perfect for clients who do not have many lashes, have sparse lashes, bald spots, or simply want a more dramatic look without having to use a thicker lash.