Not really a cushion, more like a lift.
Raised the chair seat about an inch and a half, but is not at all "cushy" for my tushy. It feels rather like the hard sit I had been trying to get rid of. Being of short stature, perhaps I do not weigh enough to make it "squish" as advertised. Took a long time to get here as well. It's "OK", but I wouldn't buy another one.
Rating: 3 stars