Many pilots who are a bit shorter, or fly airplanes with tall instrument panels or reclining seats (like a glider) may find themselves in need of a seat cushion. Pilots flying an aircraft with a stick instead of yoke should purchase a cushion with a cutout. Here are a few cusions I have tried and found to work well.
Proflight Booster Seat Cushion
This seat cushion is available in blue or red, and with or without a back cushion. It may be ordered in multiple heights, from 1 to 4 inches. This is a sturdy cushion. I own one myself. Cost varies depending on the options chosen.
Purchase a Proflight Booster Seat Cushion here
Proflight Booster Seat Cushion with Cutout
This cusion comes in blue only and with an attached back cushion. It is quite tall with a 4 inch firm seat cushion. The cutout makes it ideal for planes with a stick instead of a yoke. I have flown with one in a Remos GX, Flight Design CTLS, and a Searey. It has a velcro strap to allow you to carry it folded up. Note that it is VERY thick, so unless you are very short in a plane with a tall panel, a shorter cushion might be better.
Purchase a Proflight Booster Seat Cushion with Cutout here