I notice a lot of people here seem to use both latex and memory foam. Can someone explain the logic, as they seem two ways of achieving the same thing? Also, are they normally used in an particular order?

hellbed wrote:
They are normally used with memory foam on top of latex. This is because latex provides support and most memory foam does not provide much support - at least that's my humble opinion based on my own experience.

However, that said, if your back can take a little nn-support, the memory foam feels great.

My rule of thumb is no more than 1" of memory foam in a mattress, ever, but some use more with success.

The logic is that the latex provides the support, memory foam provides the comfort.

Personally I prefer a soft latex on top instead.

Memory foam tends to have a low level of firmness, and therefore less support.  The normal ILD might be something like 12-14.  It often is lower density as well, which also can mean less support and longevity.  Latex can have a wide range of firmness from 14-50ILD.   It tends to be denser as well, so if is better at providing support.

Memory foam molds to the body more and does not spring back quickly.  Therefore, it can have a more soft/plush comfortable feel (to some).  Personally, I like the feel of about 1" of memory foam on top, but it is hard to find good quality 1" pieces that provide enough support.  Cetain types of memory foam also retain more heat than latex.