What is the firmness like for memory foam mattresses?

I bought a full-sized serta eurotop mattress (sundown sky with pillowtop) about a year ago. I used to own a fairly firm mattress for a large portion of my life, but decided to donate it and get myself a new one. I had initially decided to go with another firm mattress, but after trying the above mentioned mattress, I thought I found myself the perfect mattress. Anyway, after a year, I find the bed much too soft and find myself "sinking" into the mattress too much. I’m heavily considering getting a new mattress and I’ve heard rave reviews about the memory foam and the sleep number bed. i know the sleep number bed, you can control the firmness, but how firm are the memory foam mattresses? i was told that different models vary in firmness, but it is FOAM after all. how hard can foam possibly be??? thanks!


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