It's 3 layers of just latex and it fits into a cotton cover so it looks like a solid mattress. It's nothing like the foam mattresses and smells much better, just a very faint vanilla scent
/savvyrest.com/ This is the one we got since we could try it out at a store. It's cheaper than some others too. I like the fact that we can change the firmness whenever we want to since our needs would change over the years.
Remember that these will last longer than a regular mattress, so you could have it for a long time, so the cost isn't so bad when you look at it that way. You might be able to pay over a period of time too.