Memory Foam Mattresses

The memory foam itself also comes in different "densities" - the higher densities usually being more expensive. Again, more is not always better. A very dense foam might be too firm for some people who would prefer the softer, lower densities.

As you might expect, the relative thicknesses and densities of the foam varies between different manufacturers. That affects the price and also how firm and supportive the mattress is - it's an important point of comparison between brands. Since everyone is different there is no "best" thickness.

Some of the memory foam mattresses you can buy have a layer of memory foam on top of a supportive layer underneath. You can even buy some that are actually configurable with interchangeable support layers. This allows you to experiment to find the best option for you and also to review your needs at a later date.

It's a confusing market with so many combinations. As always the best option - if it's practical - is to try out the mattress yourself at a store before buying.

If you already have a good quality mattress then an alternative might be to consider buying a memory foam topper (pad). This also gives more flexibility - if you decide you made the wrong choice of foam then you can just change the topper without having to change the entire matteress. But even a luxury topper won't save an old, sagging mattress!

See also: Memory Foam FAQ