Solar SP C-Tech Memory Foam Sleep System MKIISolar SP C Tech Memory Foam Sleep System MKII Hands down, the ultimate sleep system for comfort and strength. Building off of the immense success of its best selling predecessor, the list of features is endless. Utilising Memory 6, the thickest 6cm, 50 density memory foam mattress available, taking comfort to an all new high. This is combined with an upgraded, oval leg system, with a 3 leg, oversized frame, increasing this systems strength and load