it is recommended by a neighbor who bought the same king size mattress weeks ago so we got this one and it's even may put and compressed in the box and heavy.  tried several nights it is really comfortable as decribed its made 4 layers foams we hope its as cool as now feeling and we see maybe the memory of foams that the mattress still keep the original shape in mornings...so far so good, hope quality remain good as now...though we no need clock alarm wake us up in mornings...haha......and we still check doc if this mattress suitable for every one like some one with back hurt if ok.