Before I even get in to the details, just understand the beauty of this mattress is in the packaging and shipping.
Over the weekend I helped a friend assemble a new bed from DWR. Among the many packages was a very dense roll that was labeled Sonno Prima, the name of the mattress he had ordered. We looked at it with confidence that there was some mistake-- how could a roll 12 inches in diameter unfurl to be a usable mattress? Reluctantly we removed the plastic cover. Immediately the thing sprang to life, dispelling all mystery. Within moments it was a full height, full firmness mattress. Even better, it's super comfortable.