I have used the Temperfoam from RD. Not tried it in the air yet but
very comfortable in the garage!
Expensive? Only a little when compared to the =A330,000 plus so far
spent, it came to around =A3120.
Pete
Temperfoam slowly contours itself to your shape so you don't get
pressure
points on your ***, and is "G" sensitive - a fast application of G makes
it
go stiff. Used in the Shuttle seats and some ejection seats. V.
expensive,
available from Spruce, RD Aviation, etc, but well worth the expense.
M
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