Quickly produce heat reflection & circulation, collect heat for sweating while daily exercises and workout Silver waist trainer can make you raise body temperature, make you sweat crazily Good for running, gym, playing basketball and sauna, highly-effective exercise tool for men of all shape and size You wear our sauna sweat waist trimmer for running, battle rope, gym workout, and so on The waist slimmer can hold on your waist and not roll down you have belly fat