Back Lumbar Support Spine Posture Corrector For Dark Blue : Made of environmentally friendly PU material, non-toxic and odorless, neck and back , relieve pressure and provide a spine protection experience Instead of the normal lumbar support, these ergonomic backrests correct the sitting position in 15 each can help relieve tension and effectively treat muscle spasms, pinched nerves, herniated discs, sciatic nerve discomfort and degeneration excessive bending of tight knots When stretching and massaging the lower back , the PU cushion can relieve pressure and tension on the spine, and the massage points can also gently massage the spine for maximum massage and relaxation Designed for people of all ages, people of all fitness levels can benefit from using and improving flexibility Specification: Material: PU memory foam Size: 30.8x23x8cm/12x9x3.15inch Height: 10.1-15cm Function: relieve pressure and pain contains: 1 x Lumbar Stretch Pillow