Approximately 23cm of depth with a memory foam layer which contours to user's body shape. Get a Cleo memory bonnell sprung mattress. Bonnell coil spring to relieve pressure points across the body. Medium firmness - perfect for side or front sleepers. Hypo allergenic and antibacterial to prevent anti dust mites. Choose from a small single, single, small double, double or king size. Cleo Memory Bonnell Sprung Mattress | Small | Living Social