When it comes to your comfort, discover the Ashley-Sleep? 12-inch twin mattress. Its thick layer of memory foam contours to your body delivering amazing support, pressure relief and comfort. The memory foam layer is supported by a super thick layer of firm support foam. Plus, this mattress is made of hypoallergenic material, keeping dust mites, pollen, mold and pet dander out. This mattress arrives in a box for easy set up. Foundationbox spring available, sold separately.