Lay the groundwork for your workout. Pwrframe TR 3 features a totally new design highlighted by an evolved bold Pwrframe technology. It's a 3D support system that keeps you steady through every interval. This high intensity trainer is perfect for a wide range of routines and movements. The Pwrframe technology is engineered specifically for forefoot support during explosive movements. Key updates in the 3rd version include increased rubber wrap up and added flex grooves in the forefoot for increased performance. The heel shape allows the foot to be protected by Profoam EVA during all training movements.