The Uno E-Volve Sleep Memory 4000 hybrid mattress comes with our comfort inducing Uno-Q Memory Cover. Designed with a layer of Memory Foam quilted into the cover to help give even more pressure relieving support whilst contouring to the shape of your body. We have added 2000 mini springs and 2000 individually wrapped springs to this mattress, creating a breathable core of micro support and comfort that provide outstanding performance, time after time.