I love this memory foam seat cushion! I have back problems and my tailbone is actually longer than it should be, so this memory seat cushion helps me so much in relieving the pain of sitting in a normal non-cushioned chair. When I sit in a chair with no cushion my tailbone really starts to hurt and again with this memory foam seat cushion helps that. It is the perfect thickness. I sit in a chair for hours on end because I am a photographer and have to sit at the computer to edit photos. The memory foam goes back to it's original form when I get out of the chair. It conforms perfectly to me when I sit down. It is so comfortable! It's an added plus that the cover is hypoallergenic and dust mite resistant. The cover is soft and breathable so you will not get hot while sitting on it. There is a zipper so that the cover of the memory foam cushion can be taken off and washed so you're not stuck with it being damaged if something spills on it. It can be used anywhere you sit from your office chair to your car.