Mattress Depth: Nine to ten inches thick with responsive 40KG/M3 cool blue memory foam to mould around the shape of your body. Spring Mattresses: Features a 13.5 open coil bonnell spring to provide even support for all your body's pressure points. Cover Material: A deep micro quilted hypoallergenic mattress with a four way stretch fabric for extra comfort. Sizes: Comes in six different sizes that are suitable for any standard sized bed base (see full details for dimensions). Firmness: Features a medium firmness, perfect for those who like to sleep on their side. Memory Foam Mattress: Get a grey cool blue memory foam mattress. Memory Foam Mattress | Blue | Small | Living Social