Geo Matt Therapeutic Mattress Topper by Louisville Bedding is a incredibly supportive mattress topper that is made of polyurethane foam providing exceptional comfort and support. It's patented design has over 800 individual cells in various sizes to create zones of different densities for more support where needed. The patented Ring-of Air design allow air to circulate through the pad. Hospital proven.... Is use in over 5000 medical facilities nationwide. Three Year Warranty. Queen Size 58" x 75".