Sofra Racerback Workout Tank for Women Workout racerback style tank has seamless sport design with soft on your skin material. This racerback top ensures distraction free comfort with interlock seams and bound edges. Whether youre stretching or having a go for the gold workout, this top stays put. Lightweight fabric that moves with you, not against you. Runs small. Chest 26"; waist 26"; shoulder to hem 23" Material is 52% Nylon, 42% polyester, and 6% spandex.