If you go by generic mattress ratings, we call ours 'medium-firm'. But we don't think that's very helpful - and it doesn't account for the unique design of the Simba mattress. Or that it was tested using data from ten million sleepers' body profiles, making up 180 million profile points. We built over 70 prototypes which confirmed that the mattress design that suits the most sleepers is a hybrid - but not just any hybrid. We're confident ours is perfect for 95% of sleepers, and 70,000+ five-star reviews suggest we're right.