This shirt is perfect for running on a cool day or just for lounging around the house. I never get hot since it regulates body temperature really well and wicks away whatever perspiration that may occur. It is so light that you barely feel you are wearing it too. For those who think that this shirt stinks after wearing a few times, let the shirt sit around for a few days. I have worn it on several runs, sitting around the house and still haven't washed it and it still smells like a shirt that hasn't been worn. If you're really picky like me about washing your clothes as rarely/little as possible, leave this shirt out for a day or two in a clean place and the odor will be gone. After all, what's the point of the gladiodor control if it isn't utilized?