Bonnell sprung: Carefully designed and constructed with a European engineered traditional 13.5 gauge open coil Bonnell spring unit. Mattress: Get a shell cool touch Bonnell sprung memory foam mattress. Memory foam: Contains a layer of high quality next generation visco-elastic memory foam which is activated by pressure and body heat. Sizes: Option of small single, single, small double, double or king. Hypoallergenic: Designed with hypoallergenic and anti-dust mite fillings, for a cleaner healthier sleeping environment. Comfort: Topped with a shell patterned knitted modern micro-quilted cool touch top panel to provide a soft sleeping area. Bonnell Sprung Memory Foam Mattress | Single | Living Social