Sprung mattress: Get an open coil sprung mattress. Construction: With layers of fibres for extra comfort. Sprung: With a 13.5 gauge open coil spring system. Firmness: Features a medium to soft firmness - ideal for those who like to sleep on their side. Cover: With a simple damask fabric cover. Size: Choose from small single (2ft6), single (3ft), small double (4ft), double (4ft6) or king (5ft) sizes. Open Coil Sprung Mattress | Small | Living Social