What it is: A continuously buildable mascara that stacks on infinite layers of volume and length.What it does: Stack on infinite layers of 24-hour volume and length with M·A·CStack Mascara. This endlessly buildable, clump- and flake-resistant formula gives you customizable volume from natural to next-level, along with instant length. Mirror your unique mood and reflect your individuality with two brush sizes tailored to your lashes and look. The M·A·CStack Mascara features the Superstack Mega Brush that’s ideal for longer or upper lashes, while M·A·CStack Micro Mascara features the Superstack Micro Brush that’s ideal for shorter or lower lashes. Magnify your eyes and enlarge your lashes with this major mascara must-have!Research results:In a consumer test on 111 women after using Superstack Mega Brush for one week:- 95% saw endlessly buildable volume- 95% saw gravity-defying volumeHow to use: Press the brush into lashes close to roots and shimmy brush through from roots to tips. Keep stacking the clump-resistant formula for infinite volume potential.