Wear the T-shirt as leisure t-shirts, not as an undershirt or the like. Even as a simple T-Shrit the shirts are perfect, sit in a toned body very well, both the chest and the waist and biceps. Do not run a washing and keep their shape so far at least. At 1.82 and 77kg I wear a size M, perhaps a few centimeters too long, but that's a matter of taste. Size S would be against bare midriff. Because there is no intermediate size I am with M but more than satisfied. Had the shirts bought the double offer of 22 euros, for the price absolutely fine!