Specially designed to help reduce lower back ache and discomfort caused by lengthy periods of sitting. Amazing orthopaedic seat cushion, allows you to sit comfortably for hours reducing pressure on the spine, hips and coccyx(tailbone). Provides relief from lower back pain, numbness & point pressure on tail bone. Promotes healthy posture, spine alignment and more blood flow to the lower back. Helps during pregnancy, with treatment of sciatica, injured tailbone, herniated bulging, slipped or prolapsed disc, & spondylolisthesis. Made of highest quality memory foam.Dimensions - 45 cm X 35 cm X 7 cm.