I'm 210 and a fairly broad guy with an athletic build as were my wife is a 130 pound petite build. We always struggled with our mattresses because what worked for her was always to firm for me and because of my build and weight I would end up miserable. This mattress is the best thing you can buy if you have these issues. It adapts to each individual. For her she can now sleep in any position without discomfort and I can finally sleep on my back without my stomach arching up and on my side without my shoulder crunching in. King is the way to go and break in is fast. Sleeps pretty cool, I'm a hot sleeper and have only had issues a couple of times and that was because the ac was not set right. You won't regret this purchase.