MACStack Mascara is internet-famous for its endlessly buildable performance without clumping. Created to stack against and supercede the competition, this mascara puts lash customization at your fingertips. Stack on infinite layers of volume + length with this never-before-seen endlessly buildable, clump-resistant formula for natural to next-level lashes. Mirror your unique mood and reflect your individuality with two brush sizes tailored to your lashes and look.