I thought that it looked like a ton of money for what amounts to pillows, but, let's put it this way, they hold their shape under myself and my wife. That's over a quarter ton all together. The fabric they use to cover them doesn't stick to skin or anything else, but it sticks to itself like mad, so compound shapes are very possible, and those hold up under either my wife or myself, quite an endorsment of furniture that isn't acutally fastened together.
As for building them, best of luck. I couldn't figure out a way to do it that was 1) cheaper than buing them, 2) doable with the tools I have, 3) didn't run a considerable risk of turning out to be uncomfortable, and hence, languishing unused in the attic in perpetuity, 4) tested by any significant number of people, or 5) endorsed by folks who make it their business to know about these things. If you do decide to do this, make a hard core out of wood, then back it with several layers of progessively softer foam (at least 6 or 8 inches thick all told) then an extremely tight fitting fabric cover.
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Light a man a fire, and he will be warm while it burns.
Set a man on fire, and he will be warm for the rest of his life.
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