I don't care to run in skin tight clothes, so based on the sizing information and comparisons between styles I sized up one size from what I wear in other RT styles. This gave me exactly the fit I wanted in the mid-section. It also results in a longer tank, and because I'm a petite person it leaves a lot of "folds" of extra fabric up the torso and a lot of extra length at the shoulder. So the trade off is that I may need to alter mine to remove a couple inches from the shoulders, but not because there is anything wrong with the tank or RT sizing. I appreciated the sizing information about all the styles so that I was able to know ahead of ordering that I would want a size larger for a more relaxed fit. I think I would buy more of this style, but it might be a pain to feel like I need to alter them all. I may stick to the Equilibrium tank. Cute racer tank though!