Back Brace Posture Corrector - Medium or Large - New. (originally $39) **Please remember to message me the size you want after purchase** Adjustable upper back straightener posture corrector comes in S, M, and L sizes, suitable for waist sizes ranging from 26 inches to 49 inches. You can easily put on and take off the posture corrector yourself without needing assistance. It comes with four detachable fiber support rods to relieve pressure on key areas of the back, promoting a healthier spine. It helps adjust the back, strengthen the neck and shoulders, and promote a healthier lumbar spine. It not only adjusts the shoulders but also aligns the back and spine, thereby reducing discomfort in the back, neck, and shoulders. Lightweight and Breathable Material.