world's greatest mattress. very firm, i had to put a little memory foam topper on it. great cover, sewing, edges, details, all top notch. packaging was genius, they had vaccum packed it! flattened it out, rolled it like a jelly roll, you put it where you want it and cut open the plastic, air rushes in and it's huge and firm. i laid right down on it and went to sleep. low back no longer hurts. hypoallergetic, lasts 30 years, never needs turning, no springs or inner parts. what more do you need?