The Sealy Millionaire Ortho is designed in conjunction with leading orthopedic surgeons and scientists. It is created using the Zero Deflection Spring System which is built to absorb both weight and movement with no buckling or bulging meaning that you get a firm sleeping surface that will remain consistent across the entire surface of the mattress. Also incorporates Edge Guard, a dense foam construction around the perimeter of the spring unit. This edge to edge support allows you to sleep right up to the edge of the mattress without buckling. It is traditionally hand tufted design with damask fabric that locks the generous layers of upholstery to the spring system. The extra support and durability makes this mattress ideal for people of above average stature...or indeed anyone who loves a firm mattress.