Laura Geller LashBOSS Major Length, Volume, Curl Mascara Black 0.29 oz, by Laura Geller Cosmetics, features a dual-sided brush and is ideal for straight lashes, thin lashes, and short lashes. The formulation includes hydrolyzed keratin to strengthen your lashes, collagen which produces a thicker appearance. An instant curly effect is created by peptides. The application is straight forward, and you’ll experience no clumping or flaking. With LashBOSS, you will experience the best curl ever!