The endlessly buildable mascara from Mac is now available in a waterproof, smudge-proof formula for 24-hour wear! MACStack Waterproof Mascara gives you customizable volume and length in a pool-proof, tear-proof, clump-resistant formula. Its Drench-Defense Technology helps wrap this waterproof mascara around your fringe to protect each individual lash by repelling water. Stack on infinite layers of waterproof volume and length with MACStack Waterproof Mascara!