The exclusive Charter Club by Sealy Mystic Bay medium Euro top mattress features trusted Sealy® quality with an upgraded high coil density pocketed spring support system that has reinforced Steel Quantum Edge® coils. Its heavy-duty pocketed springs reduce movement, allow for an undisturbed side-to-side sleep while layers of Isotonic™ memory foam and gel foams offer pressure relief and comfort. A stretch knit cover with cooling fibers and lurex accent helps you sleep better.