LUXURY waist trainer vest with 25 steel bones The one and only 25 steel boned waist trainer with straps. 3 rows of hooks, third level compression, long length, covers back fat and love handles. How to select the right size for yourself? Measure your waist line, using a measure tape, following our steps in SIZE CHART on website. Make sure you measure tightly. If you are in-between two sizes, always choose the smaller size.