This cushion is designed to help relieve back pain, pressure points and other discomfort caused by sitting all day. It can help reduce pain from sitting due to herniated, bulged disc, sciatica, stenosis, spondylolisthesis, sacral joint pain, bruised, fractured, or inflamed tailbone, pregnancy and many other conditions.Details:Black17.5" x 18" x 3"Memory foamStays cushioned over timeCover is removable and machine washableFor indoor use