Extra Large Gel Seat Cushion,18 inch Tailbone Pillow Seat Cushion Thick Big Breathable Honeycomb Design Absorbs Pressure Cooling Seat Cushion with Non-Slip Cover for Office Chair (Blue)

i am really happy to have it, it has nice quality and really comfy for my backache.highly recommend.

Would have given it 5 stars but it slides around on seats. The bottom side has these "dots" that are supposed to be rubbery in material - to provide grip/traction and prevent sliding around. But the dots themselves are slippery.

Be careful not to use it separately as the divisions in them cause pressure on the Veins, which exposes you to sciatica. Use another pillow on top of them.