Very suitable for office computer chairs, home chairs, car seats, wheelchairs, etc.Helps relieve the symptoms of coccyx / coccyx injuries, sciatic , lumbar or back pain, hemorrhoids, pressure sores.Reduce the pressure on your back and coccyx , car, office or travel.Breathable, soft, thickened seat back cushions.specification:colour: black + blueMaterial: breathable mesh clothsize: about before expansion: 45x41cm / 17.3x16.1inchAfter expansion: 82x44cm / 32.3x17.3inchPackage Contents: 1 *CushionOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.