As some other reviewers have mentioned, slightly more firm than medium (I'm 5'10" and around 12.5 stone in weight). Might give a little over time. Definitely have to be super careful opening the cellophane as very tightly wrapped so sharps to open need to be kept away from the bed covering to avoid mishaps. Also, leave it well alone for at least twelve hours after opening to allow the mattress to regain it's depth. All in all, I am very pleased with both the mattress and Wayfair delivery.