Womens Steel Boned Waist Cincher Elastic Sexy Underbust Corset Bustier. Elastic lace and mesh. Material: 90% Polyester, 5% Cotton, 5% Elastane. Comes with 9 Piece Spiral steel bones under bust waist corset top. Package Contents: 1 * corset. Note: the amazon size chart is inaccurate; Please refer to the size detail on product description when you are ready to buy the itemss.