The Diamond mattress is 17.5cm deep and features a 13.5g traditional bonnell spring system, designed to distribute weight evenly across the surface, providing excellent posture support with a medium to firm comfort. The spring system is built to avoid roll off, providing a 100% sleeping area with edge to edge support. The strong steel rod edge support provides this mattress with resilience. The Diamond is a turn and rotate mattress, finished in a soft damask fabric and filled with layers ...