The OTC Theratex Rigid Lumbosacral Support features a high quality knitted elastic material that molds around the body contours. However, it also features a rigid exterior plastic spinal splint as well as non-elastic pull straps. This combination of elastic and non-elastic components provides for both maximum support and optimum wearing comfort. Indications Listed Below • 12” back panel with exterior rigid plastic spinal splint • Combination of breathable knitted and ribbed elastic materials in dynamic and varied patterns • Non-elastic front panel with non-abrasive fastening and adjustment • Strong non-elastic pull straps attach from spinal splint to non-elastic front panel to provide rigid support