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.
Depends on your armchair. You need more support under visco-elastic foam, so you should either build with visco foam in mind and maybe a plywood strip seat, or you should use a 2" overlay over CMHR50 (hard chipfoam). Thinner overlays aren't much use, as you sink straight through them. Many people with back problems carry a 3" cushion slab around with them, as an overlay for restaurant chairs etc.
There are many on-line suppliers of foam cut to size, but shipping isn't cheap so consider looking locally first. Some names were posted a few days ago. Disability suppliers are _very_ expensive for visco foam.
PU foam is roughly £10 / seat. latex is twice this, visco is four times it. Poor quality PU is half that.
I bought a truesleeper mattress topper - only 2"(ish) thick but is one of the best things I've ever done. I think it was about 120 quid for a kingsize mattress. I too wondered about cutting one up for use on chairs etc & I think it would be an excellent idea.
Thanks - a cushion would probably be OK - certainly worth trying - probably on top of an ordinary dining chair - e.g. for sitting at computer. How thick? Couple of inches? What is your website - or any other source of supply?
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