To find your perfect mattress and get the best night's sleep you need to make sure you choose wisely. After all, mattresses are one of the highest cost items we have in our homes and the wrong choice can be one that you are stuck with for many years to come. We’ve found that the biggest factor in suitability comes down to the mattress tension. The tension relates to how firm the mattress feels under you. A firmer mattress is more suitable for those of higher BMI or those looking for additional support for neck and back pain. Similarly, if you are of average BMI and sleep on your side you would perhaps want to consider a medium tension mattress to allow adequate sinkage for your hip and shoulder while you sleep. The quiz below takes a number of these data points and recommends a tension that should suffice.