This is the #1 most ingenious ideas I have ever seen, Or felt. The unique channel down the center of the chair relieves stress from sitting all day and from overexposure and negative tailbone pressure. Before I found this, it always felt like i was sitting on a tennis ball but after sitting in this chair for a couple of weeks and purchasing my own now that feeling is gone. I recommend this chair to anyone that sits in an office environment all day.
