Serenia Sleep 2-1/2-Inch 4-Pound Memory Foam Topper, King 4-Pound memory foam is known as the optimal density foam for sleep comfort - King 76 x 80 inch 2-1/2-Inch premium visco elastic memory foam relieves pressure points, helping cradle the body and align the spine Open-cell cool memory foam sleeps cooler than traditional memory foam Helps reduce tossing and turning Temperature sensitive, hypoallergenic, spot clean only