Ortho Posture (Postureline 1100). A medium to firm continuous coil mattress. Inside are 1100 interlinking continuous springs, renowned for generally maintaining their shape longer than a standard open coil unit. The continuous coil system has a special composure that stops roll-together and roll-off. Fibre fillings are micro quilted in place. Vents and handles are a sign of quality. It comes with a 5 year Guarantee. So buy this Ortho Posture Was £179.00 Now £169.00.