Following the comments I had read on several sites, I bought this cushion because of a herniated disc. He quickly found his place on the seat of my car. It absorbs shocks and vibrations and being able to cut off the sacrum is a plus. ergonomic design allows to be well positioned and relieves a little back avoiding tensions due to movement during driving. For cons, I find it a little too firm, following me accustomed to a softer base. Over the months we'll see if it becomes a little more flexible. The fact that the lower cushion is straight and hard does not use it on my office chair. It's a shame because I spend more time at my desk in the car ...
