At the last track day I borrowed a recaro seat base cushion from a friend's race car just to give it a try. Low and behold it was much better than the factory seat base. For one, you get to sit lower and secondly the material has rubber grip dimples on it.
Given that you sit lower in the seat you also end up having quite a bit more thigh support.
Any ways, a photo speaks a thousand words.
EDIT: Decided to redo the seat padding (after I figured out how to cut foam properly

... much better now and better on me bum

)