Feel ratings are on a numeric scale of 0 to 100, with the higher the number, the harder the feel of the mattress. In order to “score” each of our mattresses on this scale, we performed a series of firmness tests with a Cornell Tester to measure the firmness of each mattress. These ratings were converted to a 100-point scale by taking the ratio of each firmness rating to that of the highest reading. Using this method, we defined our hardest product, the Orthopedic Ultra Firm, as a 100. All other scores were calculated on a relative basis.