Sleep Comfort 5-Inch High Loft Mattress Makeover Memory Foam Topper, Twin Textured 1.5-inch layer of temperature-sensitive memory foam provides the ultimate in comfort 3.5-inch layer of solid foam gives extra support Reversible design provides a dual sleep surface Helps rejuvenate tired muscles and eases back pain Originally designed for NASA this space age foam cradles your body, reducing pressure points that cause tossing and turning