MASS21 Women's Waist Trainer Trimmer Belt Tummy Control Sport Girdle for Weight Loss Material:85%polyester + 15% Rubber hand wash(easy maintenance) Double-adjustment velcro adjustment for sizing accuracy,which gives you an Immediate Hourglass Shape and Enhances your Curves;Mesh backing for breathability 4 reinforced acrylic bones encased in heavy canvas,Waist trainer belt provides instant abdominal compression and lumbar support. Comfortable, stretchy fabric stays in place while exercising Dimensions: Width:8.7", Length: S:35.4", M:39.4", L:43.3", XL:47.2", XXL:51.2".Use our own Size Chart rather than Amazon size guide, and choose the proper size based on your waist size.