Did you know you're supposed to turn your mattress every month or two? Treat it like (assuming it is at least a full mattress) there are four positions on which you would sleep, and trade them out? Turn it around, and turn it over, and turn it around again. . . it says to do this on the label. In case the label DIDN'T say this, I don't suppose you kept the label to prove this, did you?

SRS