What It Is:Stack your lashes to new heights with a giftable, limited-edition duo of best-selling, full-sized MACStack Mascara and MACStack Legit Lift Primer. Stack on volume, length, lift and all-day hold with the good-for-lashes, oil-based primer-then stack on infinite layers of volume and length with the viral mascara featuring the Superstack Mega Brush.Set Includes:- MACStack Mascara Mega in Blackstack (full size)- MACStack Legit Lift Primer in Starkstack (full size)What It Does:MACStack Mascara:- 95% saw endlessly buildable volume*- 24-hour wear- Clump-resistant- Flake-resistantMACStack Legit Lift Primer:- Maximizes lash lift and all-day hold- Minimizes smudging & flaking- Formula made with castor seed oil, vitamin E, and pro-vitamin B5 derivatives to condition & care for lashes- Works with All mascaras- 93% said product helped reduce smudging*- 92% said lashes looked longer and more lifted**How To Use It:MACStack Legit Lift Primer:- Before mascara application, press the brush into lashes close to roots and shimmy brush through lashes from roots to tips.- Keep stacking the weightless formula with easy strokes to coat lashes completely.MACStack Mascara:- 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.*Consumer testing on 168 people after one week of product use.**Consumer testing on 177 people after one week of product use.