Reid, sorry to read about your friend. My sister had covid in January and says she has still not fully recovered. She's one of those people who rarely gets ill but since January she's never felt 100%
Mags, I looked up the Simba mattresses range after MantaLady posted about them. They aren't cheap! The luxury range starts at £1,200. Forget about just cooling, for that price I'd expect air conditioning to be thrown in too! My mattress is 7 years old in July. It's still pretty much in good shape. I think it comes with a 10 year guarantee so I'm assuming that is how long the mattress is expected to stay in decent shape.