I used this shirt on a backpack trip over July 4th weekend in the Adirondacks and it's so lightweight that it kept me nice and cool while covered up against mosquitoes and black flies. It fits very well and skims the body just enough to be flattering but not too tight. It's also long enough to wear comfortably under my backpack hip belt without riding up. It's a great shirt to wear while just hanging out or playing in the park too. I wish that the baseball style came in more colors so that I could buy more!