Characteristics: 1. treatment of back pain and low back pain. 2. Provide soft back support good poor posture prevent progressive spinal curvature and change the bad habits of kyphosis 3.12 high-energy magnets 4. Do not restrict the uni-sex design for men and women 5. Fully adjustable comfortable and easy to use Specifications: Material: neoprene elastic fabric pp bars adjustable straps Color: Black Size: M L XL Size chart: M: 26 inches-34 inches 66 cm-87 cm L: 34 inches-42 inches 87 cm-107 cm XL: 40 inches-52 inches 102 cm-132 cm Note : If your waist fits both sizes choose the smallest Package includes: 1 x Posture corrector