Thick memory foam padding gives this twin size mattress a spectacular sense of contour conforming coziness, while a base of high density foam provides dependable support for long lasting comfort. The hallmark of the Key Collection is the durable construction and quality material composition, allowing you to feel confident investing in this piece for any member of your family. Thanks to the wide variety of mattress sizes available from the Joseph Collection, it has never been easier to find the right fit for every bedroom. Length: 38.0 Width: 74.0 Height: 10.0