Product Size: S - XXL S: 55 - 72cmM: 68 - 84cmL: 81 - 97cmXL: 93 - 110cmXXL: 106 - 122cm Product Description:1. The outer strap can produce three-point support effect and improve the stability of the trunk.2. The back four aluminum support bars are designed according to the curvature of the human body, so that the back muscles and the weakened spine can...