Memory foam is higher density than regular foam, and reacts more slowly to pressure and release of pressure.

It's called "Memory" because when you place weight on it, after you remove the weight, it takes a while to return to its original shape.

Benefits? More supportive (denser), more comfortable (softer), more expensive...

I've been hearing about the Uratex ones... where can I buy Uratex memory foam? I'd like to buy a matress of the stuff and cut it up to repack my driver's seat...