For a firmer feel and edge to edge support choose an open coil mattress from Silentnight. The Silentnight Miracoil mattresses have a unique zoned Miracoil spring system that suits all shapes and sizes, with no roll together. Each of the mattresses has twice as many springs for great pressure relief and maximum sleep space. The firm support also means you have improved spine alignment so an open coil mattress is good for your back health. Like all Silentnight mattresses, including their pocket sprung mattresses, the open coil mattresses are the result of years of dedicated research. The Miracoil springs are strong, providing superior comfort for longer.