Swing Bed - Twin Size Cushion Mattress 6" profile, high density foam cushion mattress. Our mediumd density foam conforms to the contours of the body, guaranteeing a comfortable yet not too soft or not too hard ride. Upholstered in a breathable diamond-quilted fabric, this foam mattress is built to distribute weight evenly. This mattress is perfect for use as a guest bed, mattress topper for extra comfort, or on its own. The fabric is also water resistant so your mattress will not be soaked!