Step it up a notch, with an extra firm compression corset. The9 Flexi Steel Boned AggressiveBlueCore Traineris alatex and cotton corset work out band. This is one of ouraggressive core trainer for the serious waist trainer. Wear at the gym, during work outs or day to day.Compared to our basic Core Trainer that has 4 rods of boning, this compression band has 9 rods of boning making the fit of this trainer a little more firmer.