The Isabel Tank is a form-fitting racerback made from ribbed cotton with a high neckline, cutaway armholes, and just the right stretch for all-day comfort and support. The Isabel Tank is a form-fitting racerback made from ribbed cotton with a high neckline, cutaway armholes, and just the right stretch for all-day comfort and support. Established in 2003, Citizens of Humanity has been fueled by knowledge, creativity, and - above all - a love for denim. Since its start, the LA-based brand has remained committed to offering cutting-edge denim styles, unparalleled comfort, and flattering fits, all without compromising a standard for premium quality.