-- Our sauna vest uses a heat-trapping polymer fabric to boost your natural body heat and stimulate sweating with any type of physical activity. Wearing Sweat Sauna Shaper while working out or while performing daily activities creates a hot sauna-like experience. Your body temperature will rise, so you sweat more and lose water weight and shed pounds lightning-fast. Increased sweating also helps with cleansing your pores and shape your body.