It's kind of funny that the models they use are so lean and ripped, they have absolutely no need for underwear of this type. I haven't used them myself, but just reading some reviews around the web, they don't appear to be well thought of by guys who bought them. Common complaints are that the band constantly slides down or folds over on itself, and that the band loosens up quickly from washing and drying. Unless it was very, very tight, I don't see how it could be effective. Spandex can only do so much. There are probably better products on the market if you're looking for something like this...