It is a 3lb density, so it is pretty soft memory foam. My real issue is that he hills and valleys of the eggshell pattern on the one side take up 2.5 of the 4 inches, and they have very little density and support. You are really buying at best a 2'' topper, as the peaks of the eggshell side offer no real substance. (note: mattress is not as thick as appears in photo.) I regret buying it, and wish I had paid a little more to get a solid topper without that eggshell waste.