Works as advertised, as long as you use their instructions to put it on.  It is thin, and not obvious at all.  While it does slim and smooth, its not an ultra-strong or heavy compression shirt. Id say its more of a medium compression shirt.  I wear 2XL t-shirts, so I ordered an XL, per their sizing chart. It fit just right. I can recommend it, and will likely order more. Oh, be sure you put it on properly, with the X straps in the back.