This specially-designed posture corrector gently pulls your shoulders back to properly align your spine and improve your posture. It helps relieve stress and strain on your back and has 3500 Gauss magnets along the spine. Magnetic therapy has been used for centuries to help enhance circulation, reduce swelling, ease stiffness and reduce pain. The fully adjustable design is comfortable enough to wear all day long under or over your clothing. One size easily adjusts to fit men and women. Polyester.