There are 5 underwires. It has an adjustable belt structure. It contains a 3-stage graph. The inside consists entirely of thermal material. You can easily use it in sports. Designed to fit your waist. It creates a tightening effect as it comfortably wraps around the waist. It is natural and flexible, so it adapts to your body. It is made of special fabric to raise your natural body temperature and create an intense sauna experience. You will get more results with the thermal waist corset. * It is light and comfortable. Thanks to its velcro and flexible structure, it can be used easily on all bodies.* Our thermal waist corset product is also suitable for daily use with its light structure. Every detail and every stitch has been carefully considered for your comfort. It does not make you feel uncomfortable because it does not affect your daily body movements.