I originally purchased an orthopedic mattress, I have back and hip issues. The mattress to me wasn't supportive enough over the year it seemed to have softened too much. Upon inspection apparently the mattress was still how it should be but the base was wrong. I was given great advice that all the orthopedic specialist hadn't about sleep position for which have been taken up, the amazing staff have still replaced my mattress with no quibble or extra charge to a firmer one. I could not have asked for better service and help and they really do know everything about beds and sleep.
You are better off speaking to these experts before you buy as not every mattress will be suitable but they know what will. Thanks to everyone there.