Serta Triple Layer Comfort, 4-Inch Memory Foam Mattress Topper, Twin Plush, 3-layer topper provides cradling comfort and alleviates pressure points Stretch-to-fit cotton and fiberfill cover secures topper in place and is machine-washable Helps rejuvenate tired muscles and eases back pain Extends the life of your current mattress and instantly improves comfort 10 year, limited warranty