Dura Victoria Ortho Mattress - 6ft Super King Size; Designed to offer an ultra-firm support, the Victoria mattress combines a robust open coil interior, deep layers of fillings and a luxurious stretch knit fabric. A traditional hand tufted process is applied by passing nylon tapes through the mattress at regular intervals, securing them on both sides with woollen tufts. Sandwiched between the deep layers is a robust open coil interior, made up of hourglass shaped springs, set out in rows running from head to toe. Each row is attached to the next row by a spiral wire, known as a helical wire.A thick rod-edge wire surrounds the perimeter for extra edge support. The Victoria mattress is designed to be dual sided for longevity and requires to be rotated and flipped over on a regular basis to enhance its support.