The fabric is very light and soft. This is ideal for running and other athletic movements! I have size S ordered that has in the shirt of Ultra Sport also super fit in the pants I would have been happier with M. Because of the calves, the pants are unfortunately very tight, I have a calf circumference of about 34 cm. The arrows on the right leg are reflective (which I find great if you / night is the evening on the way!). The Quick-Dry function works, I actually notice very little from sweat, even when running outdoors not (at about 12 ° C). Conclusion: I have also the right of Ultra Sport Running Shirt and may you both highly recommend running. A star deduction there, because I think the pants on the calves slightly too tight.