Edit: lasted a year before it broke and had to be replaced. I use it in my cold office to make my office chair more comfortable and to protect the leather seat from wear and tear. I think both are possible. I have no problem with it slipping off although it is not kinked in any way. If you're using it in a car, it has plastic washers that slide into slots in the seat and use tension to hold the cushion in place. I don't think it makes the chair more comfortable, it's quite a thin cushion. I sit in it for several hours every day and it's pretty crushed.
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