A four-Zone combination designed for sleeping on your back, this provides different sleep feel for your head during back- or side-sleeping, as well as support that conforms to your spine. This works well if you are accustomed to sleeping on your back and need superior neck support.  

Recommended Zone combinations: 

When you use Zone D for sleeping on your back, we suggest combining it with softer Zones. For the left and right Zone Cs, we suggest somewhat harder Zones for use with side-sleeping and for shoulder support. With the Zone E providing neck support in the middle, we suggest a Zone somewhat higher than the other three, to help fill in the space under the neck and relieve neck exhaustion.