Superior authentic quality, 3-years-old, great condition with no stains as it was always encased in protective waterproof cover and is very comfortable and supportive. And king size Sealy boxspring included free if you need it. Asking $280 for the mattress (original price new $1,300+ @ Macy's). Delivery available $60.  Overview from online: At Sealy®, we believe that to be your best you have to sleep your best. And this trusted combination of materials delivers just that in the Posturepedic®  13"  Premium Technology Mattress. Gel-infused memory foam placed in the middle of the mattress provides targeted support for your back and core. Individually wrapped Response™ Pro Encased Coils paired with high-quality traditional foams provide support and comfort for your whole body while reducing motion transfer so you’ll feel less movement from your partner move. And it’s all topped with a refreshing cool-to-touch cover and a soft feel.