in 1 - Back Stretcher: You can use it both lying down and sitting. 3 LEVELS - the first level height 7 cm is the starting position that provides the least possible stretch and is good for beginners. Level two height 9 cm provides greater flexibility and is recommended for advanced users. Level three is the height 11 cm, it provides maximum stretch for advanced users. The back stretcher has acupressure massage nubs and a central comfort foam strap. They combine health properties with comfort. Lean your back against the cushion: you mobilize a stiff spine; you relax tense muscles; you eliminate stress; you relieve chronic back pain; you improve the flexibility of your shoulder and back muscles; you restore the natural curvature of the back; you eliminate paraspinal muscle tension; you increase the flexibility of the spine; you increase the range of motion and flexibility of the body; you improve the posture of the whole body. SPECIFICATION material: ABS and PP foam acupressure massage nubs: Yes comfort foam strap: Yes three adjustment levels: Yes possibility of using in sitting and lying position: Yes maximum load: 150 kg dimensions (height/width/depth): 7-11.5/25.5/37 cm weight: 0.53 kg