Sprung mattress: Get a super orthopaedic sprung mattress. Construction: 20cm deep with luxury quilted layers, designed to be hypoallergenic. Cover: With a luxury damask fabric cover that's cool and breathable. Size: Choose from small single, single, small double, double or king sizes. Layers: With a continuous 13.5 gauge orthopaedic spring unit for extra support. Firmness: Features a medium firmness - ideal for those who like to sleep on their side. Super Orthopaedic Sprung Mattress | Small | Living Social