Flat lashes, Also know as Royal Lashes, Groove Lashes and Ellipse Lashes, have a slightly oval shape rather then being rounded. The benefits of this shape is that the extensions have a much thicker look without adding weight. Flat Lashes are a great option for those clients who are hoping for a dramatic look, but don't quite have the natural lashes to hold conventional extensions. Using Flat Lashes, a 0.15 will appear as a 0.20. Since the shape of the Flat Lash is slightly oval, it hugs the natural lash resulting in improved retention.