No more uncomfortable steel bones! This waist trainer is ideal for one who likes to workout in a breathable and comfortable shaper all while turning up the heat in your core. The interior lining is anti bacterial, and non toxic, offering absorption of sweat. The sweat absorption permits wear without sweat building up on skin. This is a high compression trainer and you should not order sizing based on your clothing size or previous trainer size. It is highly recommended that you measure your waist, hips and torso. If you have a larger belly, measure torso length by placing measuring tape aligned with belly button, not at side!! See sizing chart before ordering!!