I love my new Flo Ortho mattress. One side is Firm and the opposite side is Extra Firm. I have slept on both and found them therapeutic for my back. I sleep well, am cool throughout the night, and feel it provides the perfect amount of support. It is light enough to flip over by myself, which I like. After trying both sides, I'm now opting for Firm, which surprises me because I thought I would want the Extra Firm. But having the choice if I want to change is brilliant. if you want a quality orth...