The hot selling Waist Trainer is made from a high quality elasticized material which is comfortable to wear while being tight and supportive at the same time. Each comes with 4 flexible steel bones and three rows of closure hooks to make it adjustable. The fabric is a blend of Polyester and Nylon. Enjoy FREE shipping on this item for a limited time while supplies last. Warning: this is a hot seller for spring 2017 and supplies will not last long.