Burn belly fat? Waist Trimmer or slimming belt stimulates fat burning around your waist and accelerates the removal of water and waste products. This by locally keeping the temperature under the sweatband high. For example, use the strap around your waist, leg or arm (then it is smart to order 2). The use of neoprene provides extra comfort and makes the band pleasant to wear. It strengthens the back and retains heat. You can wear the Waist Trimmer both under and over your clothes.