In an open coil mattress, the spring coils that form the mattress all move together as one unit, so if you are sleeping next to someone and they move in the night, you will move too. Vispring’s luxury pocket sprung mattresses are made with individual Vanadium steel springs that are encased in fabric pockets that are nested together in a honeycomb formation. This enables each spring to move independently from the other springs, which creates more support and less movement of the mattress when you or your partner move during sleep.