I'm having trouble running with the friction of the shirts on my nipples. Therefore, I wear the shirt NIKE mostly under the actual running shirt. It sits very well, feels good and after a short time you do not notice it that you have it at all at. But beware, it is form-fitting. Wearing running shirt in size L, in which Nike is this an XL! In the L of Nike, I looked like a sausage that was too long in the pan.