SensorPEDIC MemoryLoft Mattress Topper, Twin XL, White 75% Polyester Fiber/25% Memory Foam Clusters Imported Memory foam clusters & supportive polyester fiber fill ensure you get the best night's rest Open-cell memory foam technology keeps you cool throughout the night Polyester cover wicks away moisture & increases breathability for luxurious comfort Baffle box design & gusseted sides allow pressure-relieving fill to remain evenly distributed Anchor bands ensure secure fit atop your mattress