- Make you sweat crazy: our sauna waist trainer for women is made of neoprene composite fabric, which is stretchy and breathable. The sweat vest for women increases your body temperature, promotes blood circulation, creates 3 times the sweat effect in a short time, helps you burn calories and belly fat, allows you to achieve the ideal fast weight loss effect in a healthy way. Meanwhile, the waist trainer vest can absorb sweat quickly.