Dreamaway by Sleep Innovations 8-inch Memory Foam Mattress, Twin X-Large Top layer: 1.5 inches of open-cell memory foam provides cradling comfort Middle layer: 2.5 inches of air channel for enhanced airflow and customized support Bottom layer: 4 inches of support foam for stability and durability Distributes body weight to relieve painful pressure points that cause tossing and turning Holds its shape, with no flipping or rotating required