Expanda Mattress Pad Cover, Twin Size 2 Inch Thick 4 Pound Density Visco Elastic Memory Foam Mattress Bed Topper Made in the USA Expanda Mattress Pad Cover which fits down over the top and removes easily for laundering 2 inches of extra supportive 4 lb memory foam conforms to your body perfectly for a more restful and restorative Sleep Made in the USA using enviromentally friendly processes. Exceeds PURGreen certification standards. 4 Pound Density Memory foam reduces pressure points that cause you to toss and turn, so you sleep better. Topper features a four-pound density and featuring a famous gel-like feel.