The shirt feels nice on the skin, cool when you first put it on. If you have any excess bulges you don't want displayed to the world, avoid the white option and size up. I did not find it particularly cool to run in although running is listed as one of the recommended activities. I also live in a high humidity climate so that might have affected it. My biggest issue with this shirt is the cut. It fits nicely when standing and even slow walking, but as soon as I start running, it bunches up at the neckline above my chest. It looks weird and feels uncomfortable. Possibly designed for flat chested women only.