New from mattress manufacturers breasley is the synergy 9000 mattress with memory foam the synergy 9000 utilises a castellated high density foam as a sturdy foundation to the mattress the two greatest features of this technologically superior mattress are the 9cm of memory foam and the fabric cover the i plus memory foam in the synergy 9000 offers a great rebounding top layer and fast recovery to support the curvatures of the back and offer unbeatable suppport this i plus memory foam is a