The body brace is soft and stiff in different regions for both comfort and so the user can sense the arm's load.
身体支架在不同区域既柔软又坚硬，既舒适又让用户能够感觉到手臂的负荷。
英语百科
Back brace
（重定向自Body brace）
A back brace is a device designed to limit the motion of the spine in cases of fracture or in post-operative fusions, as well as a preventative measure against some progressive conditions.