I bought these "panties" to smooth out my butt in a very sheer bridesmaids dress I was wearing.  Let me put this in perspective, I'm 5'7", 127lbs and have very little body fat.  I do have a bit of a butt so I just didn't want the dress clinging too it and wearing regular panties would show through. I thought this would be a good option.  At first, I thought they weren't bad.  They did smooth things out and you couldn't really see them under the dress.  That being said, they're very uncomfortable and my stomach DID bulge out of the top as others have suggested.  I'm pretty damn close to having a 6-pack so if my stomach was squeezing out I can't see these things working well for many people. I was so uncomfortable in the damn things that I wish I just let my bum show.  :) The were fine in the thigh and butt area but did not fall comfortably on the stomach.  I was constantly trying to keep them pulled up and I had to sit up completely straight to keep everything in.  I might try the low waisted version or the full body suit but these are a NO GO! I don't really see myself wearing them again.  : /