As other reviewers said the mattress is less than 9” thick. Actually 8.5” at it’s highest point. Not close to the stated 10” at any point. And as others stated the mattress is not at the same height at all points being noticeably lower on at least one corner. However, I bought this mattress for a spare bedroom and it will be used sporadically so I bought the mattress even though there were enough comments on the height, or lack there of, to believe them. It was cheaper than buying a mattress at the furniture store and it is good for the purpose intended. If you are buying a mattress you intend to use on a regular basis I would suggest spending a couple hundred more dollars.