Best of both worlds! Bought this hybrid mattress for my teen son, he says its like sleeping on a cloud, he is a hot sleeper and says this bed is cool. The bed reached the full 12 inches in about 10 minutes, I am sensitive to chemical smells and this had barely a hint from the packing material, just opened a window. The bed has a high end memory foam feel on top, but the buoyancy of a regular mattress as support.  Best purchase and highly recommend.