Butter Keyhole Tank in Very BlackMeet your new favorite tank for moving, lounging, and everything in between the Spanx Butter Keyhole Tank, now available at Baseline Social, where elevated athleisure meets real life comfort. Made from buttery soft performance fabric, this tank feels like a second skin while offering sweat wicking power and 4 way stretch for all day wearability. The adjustable ruched keyhole back lets you switch up your look pull it tight for a flattering cinch or