Don't think that the "power" in power slim is an exaggeration.  These shirts are tight around the midsection!  I have an athletic build with a larger than average V from shoulders to waist (42 inch chest and 32 inch waist) and was hoping these shirts would fix the constant annoyance of regular undershirts blousing around the waist and being bulky under dress shirts.  These certainly do that, but they were overkill for what I was looking for.  I do not have a gut, and a large version of these shirts was tight enough around my mid-section that I never got accustomed to it through the work day and pretty much continuously noticed the slight discomfort of the compression.  If you want to use these to try to hide a beer gut, you're going to feel it for sure.  I also found it difficult to get on and off, straining the seams trying to get the narrow mid-section over my shoulders.  These do what they say they'll do for sure, but too much so for what I wanted, so I'm going to try the regular Hanes slim, non-"power" version, of these shirts, which I think will be more what I want for day-to-day use.  These would probably work quite well in the black color as a shirt to wear when lifting weights, though.