Hands down the best - Search no further.
This is the top seat cushion. I've had others in the past at the office and they seem to change over time. The purple seat cushion doesn't budge, it's going to last forever and it does the job. You don't get antsy and have to walk around, it's very comfortable and it's breathable. I would highly recommend, it's worth the money/you pay for what you get.
Rating: 5 stars