Twin XL Size Dream Form 2-inch Orthopedic 5-zone Cooling Gel Foam Mattress Topper Pressure Relief Twin XL: 2 inches high x 37 inches wide x 78 inches long Liquid gel-infused orthopedic foam provides pressure relieving comfort and added support 5-zone contoured design Measures 2 inches thick Breathable material increases airflow to keep you at a comfortable sleeping temperature