1Improve posture and relieve back pain, suitable for people who have to sit at your desk for hours, or have back/shoulder/neck/lower back pain due to poor posture. 2Breathable, closefitting fabric is attached to your back smoothly. 3Soft belt is wrapped under your arm, does not limit movement after wearing. 4Can easily put on, just put on the brace and adjust the shoulder pads, tie your belt comfortably, tighten the elastic strap and attach the hook & loop to the belt. 5There are four sizes, suitable for men and women, easy to choose the right size.