Size guide The River Tank is the easy, throw-on-and-go tank, with a classic scoop neck and racerback in a semi-fitted cut that skims the body instead of clinging to it. It has a built in bra with removable cups, so you get light support for yoga, Pilates, or a walk without layering a bra underneath (and you can pull the cups out if you'd rather not have them). Made from our insanely soft signature Tencel fabric, it lets your skin breathe and keeps you cool from your morning class to working from home. Our fabrics are safe and BPA free. We're dedicated to using a nontoxic tree-based fabric that's grown in a clean and regenerative way. Composition is 92% TENCEL™ Lyocell/8% ROICA™ V550 spandex. Fit Details: The River Tank is semi-fitted, skims the body, and runs true to size. Built in bra with removable cups. Care Instructions: Machine wash cold with like colors on the delicate cycle. Hang to dry.