Serta 3-Inch Memory Foam Mattress Topper, 3.5-Pound Density, Twin X-Large 3.5-Pound density premium memory foam, for the optimal balance of comfort and support Relieves pressure points to prevent tossing and turning and provide more deep sleep Helps rejuvenate tired muscles and eases back pain Extends the life of your current mattress 1 year, limited manufacturers warranty