I used my waist trimmer, along with Sweet Sweat gel, and holy hell did it make me sweat! I was literally dripping, my pants and shirt were soaked.
It's absolutely amazing! I've been wearing it every morning when I jump on the treadmill and it makes you drip sweat. It's so satisfying to see all that sweat when I take it off. I've bought other waist trimmers, but they don't make me sweat like this one.