I found I got the best results out of this if I forced myself to drink a gallon of water during the day that I was gonna wear it and the day afterwards. My stomach would be 75% less bloated depending on my diet as well.
It does make you sweat, but it only temporarily tightens the skin because you sweat out moisture trapped inside your layers of skin. It's good to use day before an event or a date. Within 48 hrs you'll be right back to where you started.