Feature 1Made of quality materials, safe, sturdy with heavy load bearing, durable for long time use, the foam is soft and compact, can reduce the impacts and offer better protection to your waist and back 2Ergonomic design fits human body's physiological curve of the spine, and help relax back and waist muscle and relieve pain. 3 height levels adjustment of the arch, you can choose the suitable level for your body 33 height levels adjustment of the arch, you can choose the suitable level for your body 4Surface acupuncture design, can stimulate the back points, promote blood circulation and massage muscles to relieve chronic back pain, correct postural imbalance 5Fit for most people to use, can be used on bed, floor, or chair, car seat, etcSpecificationFeatures: Made of quality materials, safe, sturdy with heavy load bearing, durable for long time use, the foam is soft and compact, can reduce the impacts and offer better protection to your waist and back. Ergonomic design fits human body's physiological curve of the spine, and help relax back and waist muscle and relieve pain. 3 height levels adjustment of the arch, you can choose the suitable level for your body. Surface acupuncture design, can stimulate the back points, promote blood circulation and massage muscles to relieve chronic back pain, correct postural imbalance. Fit for most people to use, can be used on bed, floor, or chair, car seat, etc. Specification: Material: ABS + NBR Color Options: Blue; Green; Purple Size: Approx. 38.5 x 25.5 x 5cm / 15.16 x 10.04 x 1.97inch Weight: Approx. 695g Package List: 1 x Back Stretcher .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }