Memory Foam Mattress Information, Comparisons and Buying Tips. MemoryFoamMattress.org was developed in response to the ever-growing number of mattress and mattress pad shoppers who have heard about benefits of memory foam but have not been given enough information to make a proper buying decision.. Our goal is to make informed buyers out of every foam mattress shopper. King Size 3 Inch Thick, 4 Pound Density Gray Visco Elastic Memory Foam Mattress Pad Bed Topper Made in the USA Queen Size 3 Inch Thick, 4 Pound Density Gray Visco Elastic Memory Foam Mattress Pad Bed Topper. Made in the USA Choosing the right mattress will help you achieve restful sleep and assist in maintaining the natural shape of your spine. Memory foam is considered the best type of mattress due to its ability to contour to the body. It molds to the body and reverts back to its neutral form as soon as the exerted pressure is removed. The Therapedic™ 2-Inch Memory Foam Mattress Topper features a Nanotex Coolest Comfort Cover that wicks away moisture to keep you cool as you sleep .