- Ergodyne ProFlex® 100 Black Back Support with rubber track is made of Spandex® cloth for breathable comfort and to hold shape. Back support has 1 1/4 detachable suspenders for comfort as well as easy adjustment and two-stage closure reminds wearers to lift properly. It has non-conductive polypropylene to provide continuous support to lower back as well as abdominal muscles and rubber track webbing for added durability. Economic back support has stretchable bias binding with zig-zag stitching for comfort. Available in sizes small thru XXLarge.