Removable contoured aluminium backstays can be easily shaped. Laminated Eva foam pad at the back for compression and lumbar stabilization. Adjustable shoulder straps with hook and loop closures can promote good back posture. Convenient sizing in two heights & two circumferences. Two upper bands are lengthened over the shoulders, pass under the arm, across the back and fasten over the abdomen permitting gradual traction of the back through retropulsion of the shoulders.