Slumber Solutions Gel 5.5-inch Memory Foam and Fiber Mattress Topper - Queen Measures 5.5 inches thick, 4 inches of gel memory foam plus 1.5 inch fiber filled cover Density: 3.2 pounds Resistant to dust mites and naturally antimicrobial Originally designed for NASA, this foam reduces pressure points that cause tossing and turning Temperature sensitive foam adjusts to body temperature