A true champion of a mattress: five energy-packed layers designed to improve sleep quality and increase durability. Symmetrically layered with polyurethane foam comforter on top and bottom; Layers of Thermobond felt under each one; and high-strength Bonnel Spring construction at the core, is made for maximum support and comfort. The added feature of a side wall around the entire perimeter prevents sagging of the sides. Side fans improve breathability. It comes with a five-year support warranty. Enjoy Kurl-on, enjoy a deep sleep.