The back stretcher is specifically designed for hunchback caused by incorrect back, this upper back brace is particularly suitable for people with a slight hunch, those looking down and those who work long hours. Features: Made of high quality polyester materials, it's simple and comfortable. Adopt back and waist double support, support back and waist muscles, and the widened adjustment belt design is more intimate to restore your health in a painless way. Waist with air holes design, ensure breathability. You adjust size of back bracket according to your body shape, may feel uncomfortable a short period time because bad back. Support your back for 20 minutes on first, gradually increasing to 1-2 hours. It helps you improve muscle memory, keep your back straight and help improve overall spinal healthy and back. Whether you are at home, in the office, or traveling, can easily use this stretcher . Specifications: Material: Polyester Size: M size: Suitable for weight about 43-60 kg, Waist about 56-63cm L size: Suitable for weight about 58-68 kg, Waist about 63-70cm XL size: Suitable for weight about 65-80 kg, Waist about 70-76cm Package Size(LxWxH): 28 x 22 x 2.5 cm(Approx.) Package Contents: 1 x Back Stretcher Please note: Due to manual measurement, there might be a tolerance in the product size. Due to the lighting effects and shooting angles, the color of the item and that shown in the picture might have a nuance.