Isabel Rib Tank in Sandatlas Citizens of Humanity Isabel Rib Tank in Sandatlas Isabel Rib Tank in Sandatlas Citizens of Humanity Citizens of Humanity Isabel Rib Tank in Sandatlas REVOLVE. A form fitting, ribbed racerback tank with a high neckline and cutaway armholes. Crafted in a lightweight, breathable organic cotton with the perfect amount of stretch for all day wearability and support. 49% Tencel Lyocell 49% Organic Cotton 2% Spandex Made in USA with imported materials