Finally sit without pressure

I tried some seat cushions and all were unsatisfactory. I need a relief on the tailbone, so that no pressure may arise as to what, for example, is the case particularly when the inflated cushion. Here the pressure is as it were distributed to the buttocks and lower leg, the pain-sensitive point is recessed. 4 stars only because I would have liked the pillow a little higher, but I've ordered another 2!