Description: Function: This back brace is effective in relieving the pains that caused by disc herniation, sciatica, scoliosis and other spine problems. Support Rods: Built in 6pcs ABS resin and spring support rods holds the wasit and stabilize waist joints, avoiding sprains and accidental injuries. Double Belt: The double pressure belt is designed to balance the force, Simulate the curve of the human lumbar vertebrae, disperse the pressure on the lumbar spine. Breathable Fabrics: The waist belt is made of quality nylon and polyester fiber, light and breathable, You will not feel too hot or too bulky when you wear it, with high elastic straps, it gives you a large range to adjust the belt to fit your body. Must have: Support your back with a brace while you work and exercise, either standing or sitting, Wear it for 2 hours a day to reduce the pressure on the lumbar spine. Specification: Material: Nylon, polyester fiber Color: Black Size Chart: M: 95x22cm/37.40x8.66inch Fits Belly Circumference: 2.07-2.5 feet  L: 108x22cm/42.52x8.66inch Fits Belly Circumference: 2.6-3.16 feet XL: 120x22cm/47.24x8.66inch Fits Belly Circumference: 3.27-3.8 feet Package Includes: 1 Piece Back Support Belt Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!