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I cannot for the life of me understand why the lump would be in the middle when it would seem if there are any lumps they should be on the sides to prevent butt groove. Perhaps there is a padding that is meant to spread the load evenly like a pillow top mattress does, but like many pillow top mattresses some areas seem to sag and end up causing discomfort for some. Best of luck ladies. Sheesh.

Some have mentioned there could be a gel filled pad in the seat cushion but I can't confirm this. If there is in fact a gel pad then it is very possible the shape of your rear is what is causing this uncomfortable egg you feel. I once bought a seat pad from Temperpedic for my office chair. It felt great when I sat on it but after just a few minutes the foam would press down and redistribute into the middle between both of my cheek bones and cause a lump in between. When I got up I could see a well defined lump in the middle, causing what I call a "Wedgie" and 2 indents where my rear end bones pressed the foam flat pushing it toward the middle. I absolutely hated that cushion and gave it away. We are now close to 2,000 miles on our RX350 and have not noticed any such problem as you describe so far but only my wife has taken a long 400 mile drive to visit family with no comfort complaints. Toward the end of this month I will be driving 10 hours straight and will have a better assessment when I get home.

Seats are designed for the "majority" of people. Unfortunately, not everyone will be comfortable in every seat. When I rented a $230,000 McLaren 570S Spider, it took only 20 minutes on the highway for the driver's seat to cause a very aggravating lower back pain. I guess I didn't fit the design very well.