This mattress will not last. We bought a king size purple plus and it was great at 1st, but it's already started to sag into an unlevel sleeping surface leaving my back/neck sore. You can't look at it and see the sag, so you can't measure it for warranty reasons, but you can definitely feel it. It's much softer and you sink way farther in the spot you normally sleep compared to the rest of the bed. It feels like our 8yr old beauty rest while only being 6monthsish old. Do not recommend.