Volume lashes (3D, 6D & Classic Lashes) is also know as Hybrid Lashes. , Multiple lash extensions are applied to one single natural eyelash, using very thin and light weight extension lashes. When 2 extensions are applied to one natural lashes, this is described as 2D. If 3 extensions are applied to one natural eyelash, then this is described as 3D, etc. As this method requires using very thin and light weight lashes, lashes appear lighter, fluffier and gives you a fuller look.