These started out as a comfortable change from regular underwear that no longer fit. The picture, however, shows a much larger width trim than what you get will have and the thinner trim, if at all tight on you at any point, will easily 'cut' into your stomach and create a fold or pressure. They're really not adjustable, at least not the ones I received. They don't even look the same as the image in construction.
There are other products that actually are as they appear/describe on amazon for similar price.