This therapeutic back support has 24 strategically placed magnets. The multi-panel knit elastic material helps enhance circulation, relax muscles, ease pain and reduce strain on your lower back. It features an adjustable "touch" closure for custom comfort and compression; as it also slims your waistline. Great for men and women, it can be worn discretely under clothing. Elastic, nylon, polyester and rayon. Sizes available in Small (27" - 34"), Medium (31" - 37"), Large (35" - 43") or Extra Large (45" - 53").