Title: Basically useless
Review: It is very uncomfortable to sit in, let alone "sit comfortably for a long time" as claimed on the web page. The diameter is only 16" much smaller than necessary for average adults. That is, you cannot stably sit in it, especially when driving. Moreover, when sitting in it, the inside circle of the ring is pushed down which causes the outside circle squeeze your buttock, resulting a very uncomfortable feeling. I bought this because of my broken coccyx. But using this item can only make my pain worse. It is a total waste of money.
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