Twin XL 1.5 Inch iSoCore 4.0 Memory Foam Mattress Topper American Made Super Soft, Luxurious and Resilient, Memory Foam Conforms to the Contours of your Body Next Generation Memory Foam Technology, 100% iSoCore 4.0 Visco Elastic Memory Foam iSoCore 4.0 memory foam products will improve the one third of your life that is spent in bed. This luxurious visco elastic material reacts to your body temperature reducing pressure points. Three Year iSoCore Manufacturer Limited Warranty! Visco Elastic Memory Foam