Chris wrote:
I have just bought a mattress made of visco-elastic memory foam - and it
is extremely comfortable - because it spreads the load well.

I'm wondering whether armchairs made of the same material would be good?
Particularly for people with back pain.

Does anyone make them already?
If not, could I make some?
Any ideas welcomed and appreciated.

Dunno, but you can buy sheets of the stuff intended to lay on top of
normal mattress, as the cheapskate route to buying the full
visco-elastic mattress (and I gather it doesn't work!). Might be worth
exploring? Don't know where you buy it I'm afraid.

David