Medium Density (Regular) foam has a compression rate of 33lbs. Medium Density foam is what is used in most of the furniture cushions out today. It is soft, yet still firm enough to support an individual to sit on without compressing very much. You can use this type of foam for furniture cushions, boat cushions, foam mattresses, etc... These are full size sheets of foam. They are 54" Wide and 72" long. In order to ship these sheets, they must be rolled up. It is recommended that when you receive your foam, you unroll it and let it regain its shape before using. PLEASE NOTE: Due to the large size of foam once it is rolled up to be shipped, we HAVE to vacuum suck all foam rubber sheets down. The Foam will NOT be its original size once you open your package.... PLEASE allow 2-3 days for the foam to "recover" to its full width.