You deserve a better night's sleep for less! King Koil mattresses feature the Contour Plus zoned innerspring system for maximum back support and a foam encased edge rail system with ECT comfort foam. The premier value mattress collection, King Koil mattresses feature fine craftsmanship and materials for a better sleep. More than 110 years of design heritage have created this collection of quality mattresses at an affordable price. Choose from six mattress sizes and add an optional box spring to complete your set!