Selling our beautiful firm king size Kingsdown SP Dane mattress because I have chronic pain and every 2-5 years it seems like I’m investing in a new mattress.. haven’t found one right one yet. We bought it at the end of 2020. "The Silent Partner Dane mattress, offers incredible comfort motion reduction. Wave Coil technology distributes weight evenly eliminating any disruption for your partner. Two layers of foam and Frost Regulating System 3, along with an AirFlow Surround Foam Encasement offer a superior sleep experience."