Ergodyne ProFlex 1650 Economy Elastic Back Support, XX-Large, Black Economy Elastic Back Support: All elastic 7.5-inch body for extra firm support. 7.5" (19 cm) Economical, all-elastic body; 5" (12.7 cm) single strap closure Non-conductive polypropylene stays; Rubber track webbing Adjustable, detachable suspenders Stretchable bias binding with zig-zag stitching