Made of high-quality fabric, the shell is made of polyester and the inner lining is neoprene fabric. The ribs are designed with 9 built in steel bones for rigidity. Smooth, comfortable, close-fitting, can be worn inside and outside, good elasticity, not easy to wrinkle. And it has excellent performance for fat burning. Double-layer compression design makes the abdomen effect more obvious. Belt + zipper combination design, and Velcro type adhesive gives a secure snug confident fit. Easy to adjust the size. Built-in 9 STEEL BONES, support shaping effect is powerful and effective. Gives you a perfect waist trimmer + waist trainer. Helps you sweat to eliminate toxins, accelerate calorie burning process, tummy control, weight loss, and promote postpartum waist recovery. Maintain muscle warmth and support to prevent fatigue and injury after exercise. Our neoprene waist trainer corsets, which built-in 9 STEEL BONES, provide enough support for back pain relief and correct your posture. It is a great fitness equipment for all kinds of exercises.