purchased after slipped disc operation to put on my car seat. If the seat is hollow it is not enough to compensate the wrong position. On a flat seat, this is perfect. Perfect on a chair or a seat. Personally I sometimes add a little sweetness with a cushion shape memory above. This cake and very very close. After three months of use, it has neither collapsed nor softened! I got used! A choice of different color would have been cool and a Velcro or other system to keep it in place.