This product designed to prevent the injury or relive the pain from back injury or sprain.  It is made of high elastic straps with vents structure which can allow good ventilation for the skin. The 2 plastic stay in the front of waist can give light support and avoid rolling up while wearing, and 4 metal stays at back can fully support and stabilization the back. The internal of belt also has anti-slip strips to avoid the slippage.  Two puller straps can help to secure the fit and give additional compression. Prolong wearing can help to correct the posture, relive the back pain.