Sprung mattress: Get a memory fibre open coil sprung mattress! Construction: With a traditional 13.5 gauge Bonnell open coil spring unit for great support. Size: Choose small single (2ft6), single (3ft), small double (4ft), double (4ft6) or king (5ft). Hypo-allergenic: With anti-dust mite and anti-bacterial features so you can sleep in comfort. Firmness: Medium soft firmness - great for those who like to sleep on their side. Cover: Features a comfortable cool-touch cover with micro-quilted top panel. Memory Fibre Open Coil Sprung Mattress | Small | Living Social