Picture yourself lying on the floor on your back. Better yet, why not lie down on your back right now on the floor to see what I'm going to explain to you about support.
Most people think support comes from a very firm mattress and what can be firmer than the floor? Make sure your legs are extending out as flat as they'll go. Take your hand down to the small of your back and try to push it between your back and the floor. Notice how your hand can readily slide your hand into the "opening?"
Now, if a hard mattress is similar to a hard floor, how can you get any back support from that? The answer is, of course, you can't—right?
Compare that with the back support of a latex mattress and you see how they differ.
The latex mattress will be pushing up and supporting your back so well that you'll have a hard time pushing your hand between the mattress and the small of your back.
With this kind of support, you won't have as much trouble with nagging back pain when you wake up in the morning.
The bottom line is that latex mattress back support normally exceeds that of most spring mattresses and is similar to memory foam in its ability to support the small of your back.