Foam Mattres

A foam mattres these days is a viscoelastic memory foam mattres. These are the be all end all for some people, but they don't work for everyone. For some, they actually create more back pain. It's a different kind of feeling than what you're used to sleeping on.

There are also latex mattreses, which aren't the same as memory foam mattreses. But latex seems to be slowly gaining in popularity.