The King Karpen plush mattress topper can be used on any of the King Karpen Mattresses to add an additional 3" of softness. Layered with Joma™ Wool Fibers on either side of a Talalay Latex core, this topper will make your great bed even more luxurious! It stays in place by buttoning to the mattress, so no worries of shifting during the night.