Mattress: Get a memory gel foam mattress with bonnell spring. Comfortable: Features a 13.5g open coil spring unit and uses a four way stretch fabric with anti dust mite and anti bacterial properties for extra comfort. Depth: Approximately 18cm thick with a layer of responsive 40KG/M3 memory foam which contours to your body's natural shape. Support: Hypoallergenic mattress which is designed to relieve pressure points across the body and promote good blood circulation. Sizes: Valid in single, small double, double, king or super king. Medium firmness: Perfect for side or front sleepers. Memory Gel Foam Mattress | Single | Living Social