Nolama Women's Waist Cincher Firm Control waist trainer Black Material: Outer layer:80% Polyamide+ 20% Spandex. Inner layer: 93% cotton + 7% Spandex. Features hook and eye closures covered by a protective zipper to offer firmer control. Covered steel boning in front and back for added support, smooth waistline, and ultra-high compression. Helps minimize waistline and midriff for an hourglass shape and perfect for wearing under an outfit. Please select your Right Size according to the Guidance in photo.