Pocketed Spring mattresses are a newer and a more superior type of spring mattress. In a Pocketed spring mattress the springs are wrapped inside an individual fabric case. Automated machines coil the wires and seal the coil inside the fabric encasement.
Once wrapped, these individual springs are attached to each other to maintain the shape of the mattress. Since only the fabric encasement is attached the coils inside can move independently of the springs adjacent to it.
Pocketed spring mattresses are superior to other mattress types due to "Zero motion transfer" .This means, you can make movements without causing the mattress to wiggle and jiggle. This lets you turn on your side without causing ripples of mattress movements or disturbing your partner.