Product material: PU (outer layer), cotton (inner layer) A product color box size: 27*20*9.5cm (10.63*7.87*3.74in) AProduct length: 119cm (46.85in) Product width: 13cm (5.12in) (before inflation), 20cm (7.87in) (after inflation) Product list: 1pc Belt, 1pc manual air pump,1pc extension belt, 1pc English manual, 1pc English color box Product name: Inflatable belt product inflatable inner layer: TPU (Special soft material) B Product length: 115cm (45.28in) Product width: 13cm (5.12in) (before inflation), 20cm (7.87in) (after inflation) B Color box size: 27.3*17.5*7.5cm (10.75*6.89*2.95in) Product characteristics Ergonomic principle, with an anti-C shape design, can strongly support the waist Vertical pull y, continuous pull y and support function, protect and reduce pressure on the lumbar spine Overview: Strengthen back and core. Stretch tight lower back muscles. Relieve lower back and stiffness. Improve nutrient flow on your spine. The belt transfers the weight of your spine. Pressure on pinched nerves. Decompress lower back joints and spinal. Stabilize the lower back and improve posture. Decompress the spine allowing for to return to normal. Help relieve pressure off pinched nerves.