Ann Darling Women's 3 Hooks Fajas Workout Latex Underbust Waist Trainer Body Shaper Imported Core Material: 100% Latex Lining: 96%cotton, 4% spandex 3 Hook-and-Eye: adjustable with the changes of the waistline and exercise intensity, while instant shaping and slimming your body. 4 spiral bones around waist trainer: with both ends fixed with extra latex pad in each waist trainer can protect your back and waist from injury during your working-out, no matter when you are doing sit-ups, squats or just sitting down. Suitable for everyday wear: this design of waist trainer is not adjusted by long rope or belt in the traditional steel boned waist training corsets, therefore can avoid all the awkward moments with the tracks on the back. It can mix and match a variety of clothes and dresses in the daily work, and more importantly, it can keep burning your fat with the special molecular materials in your everyday wear, and help with your weight losing till the end before you know it. Do NOT use default Amazon size chart. Choose size mainly based on your waistline measurement. So please view our size image and choose correct size. If you still have any doubt, please ask us. We will give your professional response.